// TortoiseMerge - a Diff/Patch program

// Copyright (C) 2003-2023 - TortoiseSVN
// Copyright (C) 2019, 2024 - TortoiseGit

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

#include "stdafx.h"
#include "registry.h"
#include "MainFrm.h"
#include "BaseView.h"
#include "DiffColors.h"
#include "StringUtils.h"
#include "AppUtils.h"
#include "GotoLineDlg.h"
#include "EncodingDlg.h"
#include "EditorConfigWrapper.h"
#include "DPIAware.h"
#include "Theme.h"
#include "DarkModeHelper.h"
#include "OnOutOfScope.h"

// Note about lines:
// We use three different kind of lines here:
// 1. The real lines of the original files.
//    These are shown in the view margin and are not used elsewhere, they're only for user information.
// 2. Screen lines.
//    The lines actually shown on screen. All methods use screen lines as parameters/outputs if not explicitly specified otherwise.
// 3. View lines.
//    These are the lines of the diff data. If unmodified sections are collapsed, not all of those lines are shown.
//
// Basically view lines are the line data, while screen lines are shown lines.

#ifdef _DEBUG
// ReSharper disable once CppInconsistentNaming
#    define new DEBUG_NEW
#endif

#define HEADERHEIGHT (CDPIAware::Instance().Scale(GetSafeHwnd(), 10))

#define IDT_SCROLLTIMER 101

CBaseView*             CBaseView::m_pwndLeft            = nullptr;
CBaseView*             CBaseView::m_pwndRight           = nullptr;
CBaseView*             CBaseView::m_pwndBottom          = nullptr;
CLocatorBar*           CBaseView::m_pwndLocator         = nullptr;
CLineDiffBar*          CBaseView::m_pwndLineDiffBar     = nullptr;
CMFCStatusBar*         CBaseView::m_pwndStatusBar       = nullptr;
CMFCRibbonStatusBar*   CBaseView::m_pwndRibbonStatusBar = nullptr;
CMainFrame*            CBaseView::m_pMainFrame          = nullptr;
CBaseView::Screen2View CBaseView::m_screen2View;
const UINT             CBaseView::FIND_DIALOG_MESSAGE = RegisterWindowMessage(FINDMSGSTRING);

AllViewState CBaseView::m_allState;

IMPLEMENT_DYNCREATE(CBaseView, CView)

CBaseView::CBaseView()
    : m_pViewData(nullptr)
    , m_pOtherViewData(nullptr)
    , m_pOtherView(nullptr)
    , m_bShowSelection(true)
    , m_bWhitespaceInlineDiffs(false)
    , m_nTopLine(0)
    , m_bEditorConfigEnabled(false)
    , m_bEditorConfigLoaded(2)
    , m_pWorkingFile(nullptr)
    , m_nStatusBarID(0)
    , m_bOtherDiffChecked(false)
    , m_bModified(FALSE)
    , m_bFocused(FALSE)
    , m_bIsHidden(FALSE)
    , m_nLineHeight(-1)
    , m_nCharWidth(-1)
    , m_nMaxLineLength(-1)
    , m_nScreenLines(-1)
    , m_nScreenChars(-1)
    , m_nLastScreenChars(-1)
    , m_nOffsetChar(0)
    , m_nDigits(0)
    , m_bInlineWordDiff(true)
    , m_nSelViewBlockStart(-1)
    , m_nSelViewBlockEnd(-1)
    , m_nMouseLine(-1)
    , m_nLDownLine(-1)
    , m_mouseInMargin(false)
    , m_bReadonly(true)
    , m_bReadonlyIsChangable(false)
    , m_bTarget(false)
    , m_nCaretGoalPos(0)
    , m_pFindDialog(nullptr)
    , m_bMatchCase(false)
    , m_bLimitToDiff(true)
    , m_bWholeWord(false)
    , m_markedWordCount(0)
    , m_pCacheBitmap(nullptr)
    , m_pDC(nullptr)
    , m_textType(CFileTextLines::AUTOTYPE)
    , m_lineEndings(EOL_AUTOLINE)
    , m_bInsertMode(true) // 2 = not evaluated
    , m_bDark(false)
    , m_themeCallbackId(0)
    , m_pState(nullptr)
{
    m_ptCaretViewPos.x         = 0;
    m_ptCaretViewPos.y         = 0;
    m_ptSelectionViewPosStart  = m_ptCaretViewPos;
    m_ptSelectionViewPosEnd    = m_ptSelectionViewPosStart;
    m_ptSelectionViewPosOrigin = m_ptSelectionViewPosEnd;
    m_bViewWhitespace          = CRegDWORD(L"Software\\TortoiseMerge\\ViewWhitespaces", 1);
    m_bViewLinenumbers         = CRegDWORD(L"Software\\TortoiseMerge\\ViewLinenumbers", 1);
    m_bShowInlineDiff          = CRegDWORD(L"Software\\TortoiseMerge\\DisplayBinDiff", TRUE);
    m_nInlineDiffMaxLineLength = CRegDWORD(L"Software\\TortoiseMerge\\InlineDiffMaxLineLength", 3000);
    m_inlineAddedBk            = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\InlineAdded", INLINEADDED_COLOR);
    m_inlineRemovedBk          = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\InlineRemoved", INLINEREMOVED_COLOR);
    m_modifiedBk               = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\ColorModifiedB", MODIFIED_COLOR);
    m_inlineAddedDarkBk        = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\DarkInlineAdded", INLINEADDED_DARK_COLOR);
    m_inlineRemovedDarkBk      = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\DarkInlineRemoved", INLINEREMOVED_DARK_COLOR);
    m_modifiedDarkBk           = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\DarkColorModifiedB", MODIFIED_DARK_COLOR);
    m_whiteSpaceFg             = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\Whitespace", CTheme::Instance().GetThemeColor(GetSysColor(COLOR_3DSHADOW)));
    m_sWordSeparators          = CRegString(L"Software\\TortoiseMerge\\WordSeparators", L"[]();:.,{}!@#$%^&*-+=|/\\<>'`~\"?");
    m_bIconLFs                 = CRegDWORD(L"Software\\TortoiseMerge\\IconLFs", 0);
    m_nTabSize                 = std::min(TABSIZE_MAX, std::max(TABSIZE_MIN, static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabSize", 4)))));
    m_nTabMode                 = static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabMode", TABMODE_NONE)));
    m_bEditorConfigEnabled     = !!static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\EnableEditorConfig", FALSE));
    std::fill_n(m_apFonts, m_fontsCount, static_cast<CFont*>(nullptr));

    int cxIcon               = GetSystemMetrics(SM_CXSMICON);
    int cyIcon               = GetSystemMetrics(SM_CYSMICON);
    m_hConflictedIcon        = CCommonAppUtils::LoadIconEx(IDI_CONFLICTEDLINE, cxIcon, cyIcon);
    m_hConflictedIgnoredIcon = CCommonAppUtils::LoadIconEx(IDI_CONFLICTEDIGNOREDLINE, cxIcon, cyIcon);
    m_hRemovedIcon           = CCommonAppUtils::LoadIconEx(IDI_REMOVEDLINE, cxIcon, cyIcon);
    m_hAddedIcon             = CCommonAppUtils::LoadIconEx(IDI_ADDEDLINE, cxIcon, cyIcon);
    m_hWhitespaceBlockIcon   = CCommonAppUtils::LoadIconEx(IDI_WHITESPACELINE, cxIcon, cyIcon);
    m_hEqualIcon             = CCommonAppUtils::LoadIconEx(IDI_EQUALLINE, cxIcon, cyIcon);
    m_hLineEndingCR          = CCommonAppUtils::LoadIconEx(IDI_LINEENDINGCR, cxIcon, cyIcon);
    m_hLineEndingCRLF        = CCommonAppUtils::LoadIconEx(IDI_LINEENDINGCRLF, cxIcon, cyIcon);
    m_hLineEndingLF          = CCommonAppUtils::LoadIconEx(IDI_LINEENDINGLF, cxIcon, cyIcon);
    m_hEditedIcon            = CCommonAppUtils::LoadIconEx(IDI_LINEEDITED, cxIcon, cyIcon);
    m_hMovedIcon             = CCommonAppUtils::LoadIconEx(IDI_MOVEDLINE, cxIcon, cyIcon);
    m_hMarkedIcon            = CCommonAppUtils::LoadIconEx(IDI_LINEMARKED, cxIcon, cyIcon);
    m_margincursor           = static_cast<HCURSOR>(LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDC_MARGINCURSOR), IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE));

    for (int i = 0; i < 1024; ++i)
        m_sConflictedText += L"??";
    m_sNoLineNr.LoadString(IDS_EMPTYLINETT);

    m_szTip[0]  = 0;
    m_wszTip[0] = 0;
    SecureZeroMemory(&m_lfBaseFont, sizeof(m_lfBaseFont));
    EnableToolTips();

    m_eols[EOL_LF]             = L"\n";   // x0a
    m_eols[EOL_CR]             = L"\r";   // x0d
    m_eols[EOL_CRLF]           = L"\r\n"; // x0d x0a
    m_eols[EOL_LFCR]           = L"\n\r";
    m_eols[EOL_VT]             = L"\v"; // x0b
    m_eols[EOL_FF]             = L"\f"; // x0c
    m_eols[EOL_NEL]            = L"\x85";
    m_eols[EOL_LS]             = L"\x2028";
    m_eols[EOL_PS]             = L"\x2029";
    m_eols[EOL_AUTOLINE]       = m_eols[m_lineEndings == EOL_AUTOLINE
                                            ? EOL_CRLF
                                            : m_lineEndings];
    m_saveParams.lineEndings = EOL::EOL_AUTOLINE;
    m_saveParams.unicodeType = CFileTextLines::AUTOTYPE;

    m_themeCallbackId = CTheme::Instance().RegisterThemeChangeCallback(
        [this]() {
            SetTheme(CTheme::Instance().IsDarkTheme());
        });
}

CBaseView::~CBaseView()
{
    CTheme::Instance().RemoveRegisteredCallback(m_themeCallbackId);
    ReleaseBitmap();
    DeleteFonts();
    DestroyIcon(m_hAddedIcon);
    DestroyIcon(m_hRemovedIcon);
    DestroyIcon(m_hConflictedIcon);
    DestroyIcon(m_hConflictedIgnoredIcon);
    DestroyIcon(m_hWhitespaceBlockIcon);
    DestroyIcon(m_hEqualIcon);
    DestroyIcon(m_hLineEndingCR);
    DestroyIcon(m_hLineEndingCRLF);
    DestroyIcon(m_hLineEndingLF);
    DestroyIcon(m_hEditedIcon);
    DestroyIcon(m_hMovedIcon);
    DestroyIcon(m_hMarkedIcon);
    DestroyCursor(m_margincursor);
}

BEGIN_MESSAGE_MAP(CBaseView, CView)
    ON_WM_VSCROLL()
    ON_WM_HSCROLL()
    ON_WM_ERASEBKGND()
    ON_WM_CREATE()
    ON_WM_DESTROY()
    ON_WM_SIZE()
    ON_WM_MOUSEWHEEL()
    ON_WM_MOUSEHWHEEL()
    ON_WM_SETCURSOR()
    ON_WM_KILLFOCUS()
    ON_WM_SETFOCUS()
    ON_WM_CONTEXTMENU()
    ON_COMMAND(ID_NAVIGATE_NEXTDIFFERENCE, OnMergeNextdifference)
    ON_COMMAND(ID_NAVIGATE_PREVIOUSDIFFERENCE, OnMergePreviousdifference)
    ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0, 0xFFFF, OnToolTipNotify)
    ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF, OnToolTipNotify)
    ON_WM_KEYDOWN()
    ON_WM_LBUTTONDOWN()
    ON_COMMAND(ID_EDIT_COPY, OnEditCopy)
    ON_WM_MOUSEMOVE()
    ON_COMMAND(ID_NAVIGATE_PREVIOUSCONFLICT, OnMergePreviousconflict)
    ON_COMMAND(ID_NAVIGATE_NEXTCONFLICT, OnMergeNextconflict)
    ON_WM_CHAR()
    ON_COMMAND(ID_CARET_DOWN, &CBaseView::OnCaretDown)
    ON_COMMAND(ID_CARET_LEFT, &CBaseView::OnCaretLeft)
    ON_COMMAND(ID_CARET_RIGHT, &CBaseView::OnCaretRight)
    ON_COMMAND(ID_CARET_UP, &CBaseView::OnCaretUp)
    ON_COMMAND(ID_CARET_WORDLEFT, &CBaseView::OnCaretWordleft)
    ON_COMMAND(ID_CARET_WORDRIGHT, &CBaseView::OnCaretWordright)
    ON_COMMAND(ID_EDIT_CUT, &CBaseView::OnEditCut)
    ON_COMMAND(ID_EDIT_PASTE, &CBaseView::OnEditPaste)
    ON_WM_TIMER()
    ON_WM_LBUTTONDBLCLK()
    ON_COMMAND(ID_NAVIGATE_NEXTINLINEDIFF, &CBaseView::OnNavigateNextinlinediff)
    ON_COMMAND(ID_NAVIGATE_PREVINLINEDIFF, &CBaseView::OnNavigatePrevinlinediff)
    ON_COMMAND(ID_EDIT_SELECTALL, &CBaseView::OnEditSelectall)
    ON_COMMAND(ID_EDIT_FIND, OnEditFind)
    ON_REGISTERED_MESSAGE(FIND_DIALOG_MESSAGE, OnFindDialogMessage)
    ON_COMMAND(ID_EDIT_FINDNEXT, OnEditFindnext)
    ON_COMMAND(ID_EDIT_FINDPREV, OnEditFindprev)
    ON_COMMAND(ID_EDIT_FINDNEXTSTART, OnEditFindnextStart)
    ON_COMMAND(ID_EDIT_FINDPREVSTART, OnEditFindprevStart)
    ON_COMMAND(ID_EDIT_GOTOLINE, &CBaseView::OnEditGotoline)
    ON_WM_LBUTTONUP()
END_MESSAGE_MAP()

void CBaseView::DocumentUpdated()
{
    ReleaseBitmap();
    m_nLineHeight              = -1;
    m_nCharWidth               = -1;
    m_nScreenChars             = -1;
    m_nLastScreenChars         = -1;
    m_nMaxLineLength           = -1;
    m_nScreenLines             = -1;
    m_nTopLine                 = 0;
    m_bModified                = FALSE;
    m_bOtherDiffChecked        = false;
    m_nDigits                  = 0;
    m_nMouseLine               = -1;
    m_nLDownLine               = -1;
    m_nTabSize                 = std::min(TABSIZE_MAX, std::max(TABSIZE_MIN, static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabSize", 4)))));
    m_nTabMode                 = static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabMode", TABMODE_NONE)));
    m_bViewLinenumbers         = CRegDWORD(L"Software\\TortoiseMerge\\ViewLinenumbers", 1);
    m_bIconLFs                 = CRegDWORD(L"Software\\TortoiseMerge\\IconLFs", 0);
    m_nInlineDiffMaxLineLength = CRegDWORD(L"Software\\TortoiseMerge\\InlineDiffMaxLineLength", 3000);
    m_eols[EOL_AUTOLINE]       = m_eols[m_lineEndings == EOL_AUTOLINE
                                            ? EOL_CRLF
                                            : m_lineEndings];
    SetEditorConfigEnabled(m_bEditorConfigEnabled);
    DeleteFonts();
    ClearCurrentSelection();
    UpdateStatusBar();
    SetTheme(CTheme::Instance().IsDarkTheme());
    Invalidate();
}

void CBaseView::SetEditorConfigEnabled(bool bEditorConfigEnabled)
{
    m_bEditorConfigEnabled = bEditorConfigEnabled;
    m_nTabSize             = std::min(TABSIZE_MAX, std::max(TABSIZE_MIN, static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabSize", 4)))));
    m_nTabMode             = static_cast<int>(static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\TabMode", TABMODE_NONE)));
    if (m_bEditorConfigEnabled)
    {
        m_bEditorConfigLoaded = FALSE; // no editorconfig entries loaded
        CEditorConfigWrapper ec;
        if (ec.Load(m_sReflectedName.IsEmpty() ? m_sFullFilePath : m_sReflectedName))
        {
            m_bEditorConfigLoaded = TRUE;
            if (ec.m_nTabWidth != nullptr)
                m_nTabSize = std::min(TABSIZE_MAX, std::max(TABSIZE_MIN, static_cast<int>(ec.m_nTabWidth)));
            if (ec.m_bIndentStyle != nullptr)
                m_nTabMode = (m_nTabMode & ~TABMODE_USESPACES) | (ec.m_bIndentStyle ? TABMODE_USESPACES : TABMODE_NONE);
        }
    }
}

void CBaseView::DPIChanged()
{
    ReleaseBitmap();
    m_nLineHeight      = -1;
    m_nCharWidth       = -1;
    m_nScreenChars     = -1;
    m_nLastScreenChars = -1;
    m_nMaxLineLength   = -1;
    m_nScreenLines     = -1;
    m_nDigits          = 0;
    DeleteFonts();
    UpdateStatusBar();
    SetTheme(CTheme::Instance().IsDarkTheme());
    EnsureCaretVisible();
    Invalidate();
}

static CString GetTabModeString(int nTabMode, int nTabSize, bool bEditorConfig)
{
    CString text;
    if (nTabMode & TABMODE_USESPACES)
        text = L"Space";
    else
        text = L"Tab";
    text.AppendFormat(L" %d", nTabSize);
    if (nTabMode & TABMODE_SMARTINDENT)
        text += L" Smart";
    if (bEditorConfig)
        text += L" EC";
    return text;
}

void CBaseView::UpdateStatusBar()
{
    int nRemovedLines    = 0;
    int nAddedLines      = 0;
    int nConflictedLines = 0;

    if (m_pViewData)
    {
        for (int i = 0; i < m_pViewData->GetCount(); i++)
        {
            DiffStates state = m_pViewData->GetState(i);
            switch (state)
            {
                case DIFFSTATE_ADDED:
                case DIFFSTATE_IDENTICALADDED:
                case DIFFSTATE_THEIRSADDED:
                case DIFFSTATE_YOURSADDED:
                case DIFFSTATE_CONFLICTADDED:
                    nAddedLines++;
                    break;
                case DIFFSTATE_IDENTICALREMOVED:
                case DIFFSTATE_REMOVED:
                case DIFFSTATE_THEIRSREMOVED:
                case DIFFSTATE_YOURSREMOVED:
                    nRemovedLines++;
                    break;
                case DIFFSTATE_CONFLICTED:
                case DIFFSTATE_CONFLICTED_IGNORED:
                    nConflictedLines++;
                    break;
                default:
                    break;
            }
        }
    }

    CString sBarText;
    CString sTemp;

    if (m_pwndStatusBar)
    {
        sBarText += CFileTextLines::GetEncodingName(m_textType);
        sBarText += sBarText.IsEmpty() ? L"" : L" ";
        sBarText += GetEolName(m_lineEndings);
        sBarText += sBarText.IsEmpty() ? L"" : L" ";

        if (sBarText.IsEmpty())
            sBarText += L" / ";
    }

    if (nRemovedLines)
    {
        sTemp.Format(IDS_STATUSBAR_REMOVEDLINES, nRemovedLines);
        if (!sBarText.IsEmpty())
            sBarText += L" / ";
        sBarText += sTemp;
    }
    if (nAddedLines)
    {
        sTemp.Format(IDS_STATUSBAR_ADDEDLINES, nAddedLines);
        if (!sBarText.IsEmpty())
            sBarText += L" / ";
        sBarText += sTemp;
    }
    if (nConflictedLines)
    {
        sTemp.Format(IDS_STATUSBAR_CONFLICTEDLINES, nConflictedLines);
        if (!sBarText.IsEmpty())
            sBarText += L" / ";
        sBarText += sTemp;
    }
    if (m_pwndStatusBar || m_pwndRibbonStatusBar)
    {
        if (m_pwndStatusBar)
        {
            UINT nID;
            UINT nStyle;
            int  cxWidth;
            if (m_nStatusBarID == ID_INDICATOR_BOTTOMVIEW)
            {
                sBarText.Format(IDS_STATUSBAR_CONFLICTS, nConflictedLines);
            }
            if (m_nStatusBarID == ID_INDICATOR_LEFTVIEW)
            {
                sTemp.LoadString(IDS_STATUSBAR_LEFTVIEW);
                sBarText = sTemp + sBarText;
            }
            if (m_nStatusBarID == ID_INDICATOR_RIGHTVIEW)
            {
                sTemp.LoadString(IDS_STATUSBAR_RIGHTVIEW);
                sBarText = sTemp + sBarText;
            }
            int nIndex = m_pwndStatusBar->CommandToIndex(m_nStatusBarID);
            m_pwndStatusBar->GetPaneInfo(nIndex, nID, nStyle, cxWidth);
            //calculate the width of the text
            CDC* pDC = m_pwndStatusBar->GetDC();
            if (pDC)
            {
                CSize size = pDC->GetTextExtent(sBarText);
                m_pwndStatusBar->SetPaneInfo(nIndex, nID, nStyle, size.cx + 2);
                ReleaseDC(pDC);
            }
            m_pwndStatusBar->SetPaneText(nIndex, sBarText);
        }
        else if (m_pwndRibbonStatusBar)
        {
            if (!IsViewGood(m_pwndBottom))
                m_pwndRibbonStatusBar->RemoveElement(ID_INDICATOR_BOTTOMVIEW);
            if ((m_nStatusBarID == ID_INDICATOR_BOTTOMVIEW) && (IsViewGood(this)))
            {
                m_pwndRibbonStatusBar->RemoveElement(ID_INDICATOR_BOTTOMVIEW);
                auto apBtnGroupBottom = std::make_unique<CMFCRibbonButtonsGroup>();
                apBtnGroupBottom->SetID(ID_INDICATOR_BOTTOMVIEW);
                apBtnGroupBottom->AddButton(new CMFCRibbonStatusBarPane(ID_SEPARATOR, CString(MAKEINTRESOURCE(IDS_STATUSBAR_BOTTOMVIEW)), TRUE));
                CMFCRibbonButton* pButton = new CMFCRibbonButton(ID_INDICATOR_BOTTOMVIEWCOMBOENCODING, L"");
                m_pMainFrame->FillEncodingButton(pButton, ID_INDICATOR_BOTTOMENCODINGSTART);
                apBtnGroupBottom->AddButton(pButton);
                pButton = new CMFCRibbonButton(ID_INDICATOR_BOTTOMVIEWCOMBOEOL, L"");
                m_pMainFrame->FillEOLButton(pButton, ID_INDICATOR_BOTTOMEOLSTART);
                apBtnGroupBottom->AddButton(pButton);
                pButton = new CMFCRibbonButton(ID_INDICATOR_BOTTOMVIEWCOMBOTABMODE, L"");
                m_pMainFrame->FillTabModeButton(pButton, ID_INDICATOR_BOTTOMTABMODESTART);
                apBtnGroupBottom->AddButton(pButton);
                apBtnGroupBottom->AddButton(new CMFCRibbonStatusBarPane(ID_INDICATOR_BOTTOMVIEW, L"", TRUE));
                m_pwndRibbonStatusBar->AddExtendedElement(apBtnGroupBottom.release(), L"");
            }

            CMFCRibbonButtonsGroup* pGroup = DYNAMIC_DOWNCAST(CMFCRibbonButtonsGroup, m_pwndRibbonStatusBar->FindByID(m_nStatusBarID));
            if (pGroup)
            {
                CMFCRibbonStatusBarPane* pPane = DYNAMIC_DOWNCAST(CMFCRibbonStatusBarPane, pGroup->GetButton(4));
                if (pPane)
                {
                    pPane->SetText(sBarText);
                }
                CMFCRibbonButton* pButton = DYNAMIC_DOWNCAST(CMFCRibbonButton, pGroup->GetButton(1));
                if (pButton)
                {
                    pButton->SetText(CFileTextLines::GetEncodingName(m_textType));
                    pButton->SetDescription(CFileTextLines::GetEncodingName(m_textType));
                }
                pButton = DYNAMIC_DOWNCAST(CMFCRibbonButton, pGroup->GetButton(2));
                if (pButton)
                {
                    pButton->SetText(GetEolName(m_lineEndings));
                    pButton->SetDescription(GetEolName(m_lineEndings));
                }
                pButton = DYNAMIC_DOWNCAST(CMFCRibbonButton, pGroup->GetButton(3));
                if (pButton)
                {
                    pButton->SetText(GetTabModeString(m_nTabMode, m_nTabSize, m_bEditorConfigEnabled && m_bEditorConfigLoaded));
                    pButton->SetDescription(GetTabModeString(m_nTabMode, m_nTabSize, m_bEditorConfigEnabled && m_bEditorConfigLoaded));
                }
            }
            if (m_pwndRibbonStatusBar->GetSafeHwnd())
            {
                m_pwndRibbonStatusBar->RecalcLayout();
                m_pwndRibbonStatusBar->Invalidate();
            }
        }
    }
}

BOOL CBaseView::PreCreateWindow(CREATESTRUCT& cs)
{
    if (!CView::PreCreateWindow(cs))
        return FALSE;

    cs.dwExStyle |= WS_EX_CLIENTEDGE;
    cs.style &= ~WS_BORDER;
    cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS,
                                       ::LoadCursor(nullptr, IDC_ARROW), reinterpret_cast<HBRUSH>(COLOR_WINDOW + 1), nullptr);

    CWnd* pParentWnd = CWnd::FromHandlePermanent(cs.hwndParent);
    if (!pParentWnd || !pParentWnd->IsKindOf(RUNTIME_CLASS(CSplitterWnd)))
    {
        //  View must always create its own scrollbars,
        //  if only it's not used within splitter
        cs.style |= (WS_HSCROLL | WS_VSCROLL);
    }
    cs.lpszClass = AfxRegisterWndClass(CS_DBLCLKS);
    return TRUE;
}

CFont* CBaseView::GetFont(BOOL bItalic /*= FALSE*/, BOOL bBold /*= FALSE*/)
{
    int nIndex = 0;
    if (bBold)
        nIndex |= 1;
    if (bItalic)
        nIndex |= 2;
    if (!m_apFonts[nIndex])
    {
        m_apFonts[nIndex]      = new CFont;
        m_lfBaseFont.lfCharSet = DEFAULT_CHARSET;
        m_lfBaseFont.lfWeight  = bBold ? FW_BOLD : FW_NORMAL;
        m_lfBaseFont.lfItalic  = static_cast<BYTE>(bItalic);
        m_lfBaseFont.lfHeight  = -CDPIAware::Instance().PointsToPixels(GetSafeHwnd(), static_cast<DWORD>(CRegDWORD(L"Software\\TortoiseMerge\\FontSize", 10)));
        wcsncpy_s(m_lfBaseFont.lfFaceName, static_cast<LPCWSTR>(static_cast<CString>(CRegString(L"Software\\TortoiseMerge\\FontName", L"Consolas"))), _countof(m_lfBaseFont.lfFaceName) - 1);
        if (!m_apFonts[nIndex]->CreateFontIndirect(&m_lfBaseFont))
        {
            delete m_apFonts[nIndex];
            m_apFonts[nIndex] = nullptr;
            return CView::GetFont();
        }
    }
    return m_apFonts[nIndex];
}

void CBaseView::CalcLineCharDim()
{
    CDC* pDC = GetDC();
    if (!pDC)
        return;
    CFont*      pOldFont  = pDC->SelectObject(GetFont());
    const CSize szCharExt = pDC->GetTextExtent(L"X");
    pDC->SelectObject(pOldFont);
    ReleaseDC(pDC);

    m_nLineHeight = szCharExt.cy;
    if (m_nLineHeight <= 0)
        m_nLineHeight = -1;
    m_nCharWidth = szCharExt.cx;
    if (m_nCharWidth <= 0)
        m_nCharWidth = -1;
}

int CBaseView::GetScreenChars()
{
    if (m_nScreenChars == -1)
    {
        CRect rect;
        GetClientRect(&rect);
        m_nScreenChars = (rect.Width() - GetMarginWidth() - GetSystemMetrics(SM_CXVSCROLL)) / GetCharWidth();
        if (m_nScreenChars < 0)
            m_nScreenChars = 0;
    }
    return m_nScreenChars;
}

int CBaseView::GetAllMinScreenChars() const
{
    int nChars = INT_MAX;
    if (IsLeftViewGood())
        nChars = std::min<int>(nChars, m_pwndLeft->GetScreenChars());
    if (IsRightViewGood())
        nChars = std::min<int>(nChars, m_pwndRight->GetScreenChars());
    if (IsBottomViewGood())
        nChars = std::min<int>(nChars, m_pwndBottom->GetScreenChars());
    return (nChars == INT_MAX) ? 0 : nChars;
}

int CBaseView::GetAllMaxLineLength() const
{
    int nLength = 0;
    if (IsLeftViewGood())
        nLength = std::max<int>(nLength, m_pwndLeft->GetMaxLineLength());
    if (IsRightViewGood())
        nLength = std::max<int>(nLength, m_pwndRight->GetMaxLineLength());
    if (IsBottomViewGood())
        nLength = std::max<int>(nLength, m_pwndBottom->GetMaxLineLength());
    return nLength;
}

int CBaseView::GetLineHeight()
{
    if (m_nLineHeight == -1)
        CalcLineCharDim();
    if (m_nLineHeight <= 0)
        return 1;
    return m_nLineHeight;
}

int CBaseView::GetCharWidth()
{
    if (m_nCharWidth == -1)
        CalcLineCharDim();
    if (m_nCharWidth <= 0)
        return 1;
    return m_nCharWidth;
}

int CBaseView::GetMaxLineLength()
{
    if (m_nMaxLineLength == -1)
    {
        m_nMaxLineLength = 0;
        int nLineCount   = GetLineCount();
        if (nLineCount == 1)
        {
            m_nMaxLineLength = GetLineLengthWithTabsConverted(0);
            return m_nMaxLineLength;
        }
        for (int i = 0; i < nLineCount; i++)
        {
            int nActualLength = GetLineLengthWithTabsConverted(i);
            if (m_nMaxLineLength < nActualLength)
                m_nMaxLineLength = nActualLength;
        }
    }
    return m_nMaxLineLength;
}

int CBaseView::GetLineLengthWithTabsConverted(int index)
{
    if (!m_pViewData)
        return 0;
    if (m_pViewData->GetCount() == 0)
        return 0;
    if (static_cast<int>(m_screen2View.size()) <= index)
        return 0;
    CString sLine;
    if (m_pMainFrame->m_bWrapLines)
        sLine = GetLineChars(index);
    else
    {
        int viewLine = GetViewLineForScreen(index);
        sLine        = m_pViewData->GetLine(viewLine);
    }
    int      tabCount    = 0;
    wchar_t* pChar       = const_cast<LPWSTR>(static_cast<LPCWSTR>(sLine));
    auto     nLineLength = sLine.GetLength();
    for (int i = 0; i < nLineLength; ++i)
    {
        if (*pChar == '\t')
            ++tabCount;
        ++pChar;
    }
    // GetTabSize() - 1 because the tabs are already counted
    nLineLength = nLineLength + (tabCount * (GetTabSize() - 1));
    ASSERT(nLineLength >= 0);
    return nLineLength;
}

int CBaseView::GetLineLength(int index)
{
    if (!m_pViewData)
        return 0;
    if (m_pViewData->GetCount() == 0)
        return 0;
    if (static_cast<int>(m_screen2View.size()) <= index)
        return 0;
    int viewLine = GetViewLineForScreen(index);
    if (m_pMainFrame->m_bWrapLines)
    {
        int nLineLength = GetLineChars(index).GetLength();
        ASSERT(nLineLength >= 0);
        return nLineLength;
    }
    int nLineLength = m_pViewData->GetLine(viewLine).GetLength();
    ASSERT(nLineLength >= 0);
    return nLineLength;
}

int CBaseView::GetViewLineLength(int nViewLine) const
{
    if (!m_pViewData)
        return 0;
    if (m_pViewData->GetCount() <= nViewLine)
        return 0;
    int nLineLength = m_pViewData->GetLine(nViewLine).GetLength();
    ASSERT(nLineLength >= 0);
    return nLineLength;
}

int CBaseView::GetLineCount() const
{
    if (!m_pViewData)
        return 1;
    int nLineCount = static_cast<int>(m_screen2View.size());
    ASSERT(nLineCount >= 0);
    return nLineCount;
}

int CBaseView::GetSubLineOffset(int index)
{
    return m_screen2View.GetSubLineOffset(index);
}

CString CBaseView::GetViewLineChars(int nViewLine) const
{
    if (!m_pViewData)
        return nullptr;
    if (m_pViewData->GetCount() <= nViewLine)
        return nullptr;
    return m_pViewData->GetLine(nViewLine);
}

CString CBaseView::GetLineChars(int index)
{
    if (!m_pViewData)
        return nullptr;
    if (m_pViewData->GetCount() == 0)
        return nullptr;
    if (static_cast<int>(m_screen2View.size()) <= index)
        return nullptr;
    int viewLine = GetViewLineForScreen(index);
    if (m_pMainFrame->m_bWrapLines)
    {
        int subLine = GetSubLineOffset(index);
        if (subLine >= 0)
        {
            if (subLine < CountMultiLines(viewLine))
            {
                return m_screenedViewLine[viewLine].m_subLines[subLine];
            }
            return L"";
        }
    }
    return m_pViewData->GetLine(viewLine);
}

void CBaseView::CheckOtherView()
{
    if (m_bOtherDiffChecked)
        return;
    // find out what the 'other' file is
    m_pOtherViewData = nullptr;
    m_pOtherView     = nullptr;
    if (this == m_pwndLeft && IsRightViewGood())
    {
        m_pOtherViewData = m_pwndRight->m_pViewData;
        m_pOtherView     = m_pwndRight;
    }

    if (this == m_pwndRight && IsLeftViewGood())
    {
        m_pOtherViewData = m_pwndLeft->m_pViewData;
        m_pOtherView     = m_pwndLeft;
    }

    m_bOtherDiffChecked = true;
}

void CBaseView::GetWhitespaceBlock(CViewData* viewData, int nLineIndex, int& nStartBlock, int& nEndBlock)
{
    enum
    {
        MAX_WHITESPACEBLOCK_SIZE = 8
    };
    ASSERT(viewData);

    DiffStates origstate = viewData->GetState(nLineIndex);

    // Go back and forward at most MAX_WHITESPACEBLOCK_SIZE lines to see where this block ends
    nStartBlock = nLineIndex;
    nEndBlock   = nLineIndex;
    while ((nStartBlock > 0) && (nStartBlock > (nLineIndex - MAX_WHITESPACEBLOCK_SIZE)))
    {
        DiffStates state = viewData->GetState(nStartBlock - 1);
        if ((origstate == DIFFSTATE_EMPTY) && (state != DIFFSTATE_NORMAL))
            origstate = state;
        if ((origstate == state) || (state == DIFFSTATE_EMPTY))
            nStartBlock--;
        else
            break;
    }
    while ((nEndBlock < (viewData->GetCount() - 1)) && (nEndBlock < (nLineIndex + MAX_WHITESPACEBLOCK_SIZE)))
    {
        DiffStates state = viewData->GetState(nEndBlock + 1);
        if ((origstate == DIFFSTATE_EMPTY) && (state != DIFFSTATE_NORMAL))
            origstate = state;
        if ((origstate == state) || (state == DIFFSTATE_EMPTY))
            nEndBlock++;
        else
            break;
    }
}

CString CBaseView::GetWhitespaceString(CViewData* viewData, int nStartBlock, int nEndBlock) const
{
    enum
    {
        MAX_WHITESPACEBLOCK_SIZE = 8
    };

    int len = 0;
    for (int i = nStartBlock; i <= nEndBlock; ++i)
        len += viewData->GetLine(i).GetLength() + 2;

    CString block;
    // do not check for whitespace blocks if the line is too long, because
    // reserving a lot of memory here takes too much time (performance hog)
    if (len > MAX_WHITESPACEBLOCK_SIZE * 256)
        return block;
    block.Preallocate(len + 1);
    for (int i = nStartBlock; i <= nEndBlock; ++i)
    {
        block += viewData->GetLine(i);
        block += m_eols[viewData->GetLineEnding(i)];
    }
    return block;
}

bool CBaseView::IsBlockWhitespaceOnly(int nLineIndex, bool& bIdentical, int& blockstart, int& blockend)
{
    if (!m_pViewData)
        return false;
    bIdentical = false;
    CheckOtherView();
    if (!m_pOtherViewData)
        return false;
    int viewLine = GetViewLineForScreen(nLineIndex);
    if (
        (m_pViewData->GetState(viewLine) == DIFFSTATE_NORMAL) &&
        (m_pOtherViewData->GetLine(viewLine) == m_pViewData->GetLine(viewLine)))
    {
        bIdentical = true;
        return false;
    }
    // first check whether the line itself only has whitespace changes
    CString mine  = m_pViewData->GetLine(viewLine);
    CString other = m_pOtherViewData->GetLine(min(viewLine, m_pOtherViewData->GetCount() - 1));
    if (mine.IsEmpty() && other.IsEmpty())
    {
        bIdentical = true;
        return false;
    }

    if (mine == other)
    {
        bIdentical = true;
        return true;
    }
    FilterWhitespaces(mine, other);
    if (mine == other)
        return true;

    int nStartBlock2, nEndBlock2;
    GetWhitespaceBlock(m_pViewData, viewLine, blockstart, blockend);
    GetWhitespaceBlock(m_pOtherViewData, min(viewLine, m_pOtherViewData->GetCount() - 1), nStartBlock2, nEndBlock2);
    mine = GetWhitespaceString(m_pViewData, blockstart, blockend);
    if (mine.IsEmpty())
        bIdentical = false;
    else
    {
        other      = GetWhitespaceString(m_pOtherViewData, nStartBlock2, nEndBlock2);
        bIdentical = mine == other;
        FilterWhitespaces(mine, other);
    }

    return (!mine.IsEmpty()) && (mine == other);
}

bool CBaseView::IsViewLineHidden(int nViewLine) const
{
    return IsViewLineHidden(m_pViewData, nViewLine);
}

bool CBaseView::IsViewLineHidden(CViewData* pViewData, int nViewLine)
{
    return m_pMainFrame->m_bCollapsed && (pViewData->GetHideState(nViewLine) != HIDESTATE_SHOWN);
}

int CBaseView::GetLineNumber(int index) const
{
    if (!m_pViewData)
        return -1;
    int viewLine = GetViewLineForScreen(index);
    if (m_pViewData->GetLineNumber(viewLine) == DIFF_EMPTYLINENUMBER)
        return -1;
    return m_pViewData->GetLineNumber(viewLine);
}

int CBaseView::GetScreenLines()
{
    if (m_nScreenLines == -1)
    {
        CRect rect;
        GetClientRect(&rect);
        int           scrollBarHeight = 0;
        SCROLLBARINFO sbi             = {sizeof(sbi)};
        if (GetScrollBarInfo(OBJID_HSCROLL, &sbi))
        {
            // only use the scroll bar size if the info is correct and the scrollbar is visible
            // if anything isn't proper, assume the scrollbar has a size of zero
            // and calculate the screen lines without it.
            if (!(sbi.rgstate[0] & STATE_SYSTEM_INVISIBLE) && !(sbi.rgstate[0] & STATE_SYSTEM_UNAVAILABLE))
            {
                scrollBarHeight = sbi.rcScrollBar.bottom - sbi.rcScrollBar.top;
                m_nScreenLines  = (rect.Height() - HEADERHEIGHT - scrollBarHeight) / GetLineHeight();
                if (m_nScreenLines < 0)
                    m_nScreenLines = 0;
                return m_nScreenLines;
            }
        }
        // if the scroll bar is not visible, unavailable or there was an error,
        // assume the scroll bar height is zero and return the screen lines here.
        // Of course, that means the cache (using the member variable) won't work
        // and we fetch the scroll bar info every time. But in this case the overhead is necessary.
        return (rect.Height() - HEADERHEIGHT) / GetLineHeight();
    }
    return m_nScreenLines;
}

int CBaseView::GetAllMinScreenLines() const
{
    int nLines = INT_MAX;
    if (IsLeftViewGood())
        nLines = m_pwndLeft->GetScreenLines();
    if (IsRightViewGood())
        nLines = std::min<int>(nLines, m_pwndRight->GetScreenLines());
    if (IsBottomViewGood())
        nLines = std::min<int>(nLines, m_pwndBottom->GetScreenLines());
    return (nLines == INT_MAX) || (nLines < 0) ? 0 : nLines;
}

int CBaseView::GetAllLineCount() const
{
    int nLines = 0;
    if (IsLeftViewGood())
        nLines = m_pwndLeft->GetLineCount();
    if (IsRightViewGood())
        nLines = std::max<int>(nLines, m_pwndRight->GetLineCount());
    if (IsBottomViewGood())
        nLines = std::max<int>(nLines, m_pwndBottom->GetLineCount());
    return nLines;
}

void CBaseView::RecalcAllVertScrollBars(BOOL bPositionOnly /*= FALSE*/)
{
    if (IsLeftViewGood())
        m_pwndLeft->RecalcVertScrollBar(bPositionOnly);
    if (IsRightViewGood())
        m_pwndRight->RecalcVertScrollBar(bPositionOnly);
    if (IsBottomViewGood())
        m_pwndBottom->RecalcVertScrollBar(bPositionOnly);
}

void CBaseView::RecalcVertScrollBar(BOOL bPositionOnly /*= FALSE*/)
{
    SCROLLINFO si;
    si.cbSize = sizeof(si);
    if (bPositionOnly)
    {
        si.fMask = SIF_POS;
        si.nPos  = m_nTopLine;
    }
    else
    {
        EnableScrollBarCtrl(SB_VERT, TRUE);
        if (GetAllMinScreenLines() >= GetAllLineCount() && m_nTopLine > 0)
        {
            m_nTopLine = 0;
            Invalidate();
        }
        si.fMask = SIF_DISABLENOSCROLL | SIF_PAGE | SIF_POS | SIF_RANGE;
        si.nMin  = 0;
        si.nMax  = GetAllLineCount();
        si.nPage = GetAllMinScreenLines();
        si.nPos  = m_nTopLine;
    }
    VERIFY(SetScrollInfo(SB_VERT, &si));
}

void CBaseView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    CView::OnVScroll(nSBCode, nPos, pScrollBar);
    if (m_pwndLeft)
        m_pwndLeft->OnDoVScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndRight)
        m_pwndRight->OnDoVScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndBottom)
        m_pwndBottom->OnDoVScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

void CBaseView::OnDoVScroll(UINT nSBCode, UINT /*nPos*/, CScrollBar* /*pScrollBar*/, CBaseView* master)
{
    //  Note we cannot use nPos because of its 16-bit nature
    SCROLLINFO si;
    si.cbSize = sizeof(si);
    si.fMask  = SIF_ALL;
    VERIFY(master->GetScrollInfo(SB_VERT, &si));

    int nPageLines = GetScreenLines();
    int nLineCount = GetLineCount();

    int nNewTopLine;

    static LONG    textWidth = 0;
    static CString sFormat(MAKEINTRESOURCE(IDS_VIEWSCROLLTIPTEXT));
    switch (nSBCode)
    {
        case SB_TOP:
            nNewTopLine = 0;
            break;
        case SB_BOTTOM:
            nNewTopLine = nLineCount - nPageLines + 1;
            break;
        case SB_LINEUP:
            nNewTopLine = m_nTopLine - 1;
            break;
        case SB_LINEDOWN:
            nNewTopLine = m_nTopLine + 1;
            break;
        case SB_PAGEUP:
            nNewTopLine = m_nTopLine - si.nPage + 1;
            break;
        case SB_PAGEDOWN:
            nNewTopLine = m_nTopLine + si.nPage - 1;
            break;
        case SB_THUMBPOSITION:
            m_scrollTool.Clear();
            nNewTopLine = si.nTrackPos;
            textWidth   = 0;
            break;
        case SB_THUMBTRACK:
            nNewTopLine = si.nTrackPos;
            if (GetFocus() == this)
            {
                RECT thumbRect;
                GetClientRect(&thumbRect);
                ClientToScreen(&thumbRect);

                POINT thumbpoint;
                thumbpoint.x = thumbRect.right;
                thumbpoint.y = thumbRect.top + ((thumbRect.bottom - thumbRect.top) * si.nTrackPos) / (si.nMax - si.nMin);
                m_scrollTool.Init(&thumbpoint);
                if (textWidth == 0)
                {
                    CString sTemp = sFormat;
                    sTemp.Format(sFormat, m_nDigits, 10 * m_nDigits - 1);
                    textWidth = m_scrollTool.GetTextWidth(sTemp);
                }
                thumbpoint.x -= textWidth;
                int line = GetLineNumber(nNewTopLine);
                if (line >= 0)
                    m_scrollTool.SetText(&thumbpoint, sFormat, m_nDigits, GetLineNumber(nNewTopLine) + 1);
                else
                    m_scrollTool.SetText(&thumbpoint, m_sNoLineNr);
            }
            break;
        default:
            return;
    }

    if (nNewTopLine < 0)
        nNewTopLine = 0;
    if (nNewTopLine >= nLineCount)
        nNewTopLine = nLineCount - 1;
    ScrollToLine(nNewTopLine);
}

void CBaseView::RecalcAllHorzScrollBars(BOOL bPositionOnly /*= FALSE*/)
{
    if (IsLeftViewGood())
        m_pwndLeft->RecalcHorzScrollBar(bPositionOnly);
    if (IsRightViewGood())
        m_pwndRight->RecalcHorzScrollBar(bPositionOnly);
    if (IsBottomViewGood())
        m_pwndBottom->RecalcHorzScrollBar(bPositionOnly);
}

void CBaseView::RecalcHorzScrollBar(BOOL bPositionOnly /*= FALSE*/)
{
    SCROLLINFO si;
    si.cbSize = sizeof(si);
    if (bPositionOnly)
    {
        si.fMask = SIF_POS;
        si.nPos  = m_nOffsetChar;
    }
    else
    {
        EnableScrollBarCtrl(SB_HORZ, !m_pMainFrame->m_bWrapLines);
        if (!m_pMainFrame->m_bWrapLines)
        {
            int minScreenChars = GetAllMinScreenChars();
            int maxLineLength  = GetAllMaxLineLength();
            if (minScreenChars >= maxLineLength && m_nOffsetChar > 0)
            {
                m_nOffsetChar = 0;
                Invalidate();
            }
            si.fMask = SIF_DISABLENOSCROLL | SIF_PAGE | SIF_POS | SIF_RANGE;
            si.nMin  = 0;
            si.nMax  = m_pMainFrame->m_bWrapLines ? minScreenChars : maxLineLength;
            si.nMax += GetMarginWidth() / GetCharWidth();
            si.nPage = GetScreenChars();
            si.nPos  = m_nOffsetChar;
        }
    }
    VERIFY(SetScrollInfo(SB_HORZ, &si));
}

void CBaseView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    CView::OnHScroll(nSBCode, nPos, pScrollBar);
    if (m_pwndLeft)
        m_pwndLeft->OnDoHScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndRight)
        m_pwndRight->OnDoHScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndBottom)
        m_pwndBottom->OnDoHScroll(nSBCode, nPos, pScrollBar, this);
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

void CBaseView::OnDoHScroll(UINT nSBCode, UINT /*nPos*/, CScrollBar* /*pScrollBar*/, CBaseView* master)
{
    SCROLLINFO si;
    si.cbSize = sizeof(si);
    si.fMask  = SIF_ALL;
    VERIFY(master->GetScrollInfo(SB_HORZ, &si));

    int nPageChars     = GetScreenChars();
    int nMaxLineLength = GetMaxLineLength();

    int nNewOffset;
    switch (nSBCode)
    {
        case SB_LEFT:
            nNewOffset = 0;
            break;
        case SB_BOTTOM:
            nNewOffset = nMaxLineLength - nPageChars + 1;
            break;
        case SB_LINEUP:
            nNewOffset = m_nOffsetChar - 1;
            break;
        case SB_LINEDOWN:
            nNewOffset = m_nOffsetChar + 1;
            break;
        case SB_PAGEUP:
            nNewOffset = m_nOffsetChar - si.nPage + 1;
            break;
        case SB_PAGEDOWN:
            nNewOffset = m_nOffsetChar + si.nPage - 1;
            break;
        case SB_THUMBPOSITION:
        case SB_THUMBTRACK:
            nNewOffset = si.nTrackPos;
            break;
        default:
            return;
    }

    if (nNewOffset >= nMaxLineLength)
        nNewOffset = nMaxLineLength - 1;
    if (nNewOffset < 0)
        nNewOffset = 0;
    ScrollToChar(nNewOffset, TRUE);
}

void CBaseView::ScrollToChar(int nNewOffsetChar, BOOL bTrackScrollBar /*= TRUE*/)
{
    if (m_nOffsetChar != nNewOffsetChar)
    {
        int nScrollChars = m_nOffsetChar - nNewOffsetChar;
        m_nOffsetChar    = nNewOffsetChar;
        CRect rcScroll;
        GetClientRect(&rcScroll);
        rcScroll.left += GetMarginWidth();
        rcScroll.top += GetLineHeight() + HEADERHEIGHT;
        ScrollWindow(nScrollChars * GetCharWidth(), 0, &rcScroll, &rcScroll);
        // update the view header
        rcScroll.left   = 0;
        rcScroll.top    = 0;
        rcScroll.bottom = GetLineHeight() + HEADERHEIGHT;
        InvalidateRect(&rcScroll, FALSE);
        UpdateWindow();
        if (bTrackScrollBar)
            RecalcHorzScrollBar(TRUE);
        UpdateCaret();
        if (m_pwndLineDiffBar)
            m_pwndLineDiffBar->Invalidate();
    }
}

void CBaseView::ScrollAllToChar(int nNewOffsetChar, BOOL bTrackScrollBar /* = TRUE */)
{
    if (m_pwndLeft)
        m_pwndLeft->ScrollToChar(nNewOffsetChar, bTrackScrollBar);
    if (m_pwndRight)
        m_pwndRight->ScrollToChar(nNewOffsetChar, bTrackScrollBar);
    if (m_pwndBottom)
        m_pwndBottom->ScrollToChar(nNewOffsetChar, bTrackScrollBar);
}

void CBaseView::ScrollAllSide(int delta)
{
    int nNewOffset = m_nOffsetChar;
    nNewOffset += delta;
    int nMaxLineLength = GetMaxLineLength();
    if (nNewOffset >= nMaxLineLength)
        nNewOffset = nMaxLineLength - 1;
    if (nNewOffset < 0)
        nNewOffset = 0;
    ScrollAllToChar(nNewOffset, TRUE);
    if (m_pwndLineDiffBar)
        m_pwndLineDiffBar->Invalidate();
    UpdateCaret();
}

void CBaseView::ScrollSide(int delta)
{
    int nNewOffset = m_nOffsetChar;
    nNewOffset += delta;
    int nMaxLineLength = GetMaxLineLength();
    if (nNewOffset >= nMaxLineLength)
        nNewOffset = nMaxLineLength - 1;
    if (nNewOffset < 0)
        nNewOffset = 0;
    ScrollToChar(nNewOffset, TRUE);
    if (m_pwndLineDiffBar)
        m_pwndLineDiffBar->Invalidate();
    UpdateCaret();
}

void CBaseView::ScrollVertical(short zDelta)
{
    const int nLineCount = GetLineCount();
    int       nTopLine   = m_nTopLine;
    nTopLine -= (zDelta / 30);
    if (nTopLine < 0)
        nTopLine = 0;
    if (nTopLine >= nLineCount)
        nTopLine = nLineCount - 1;
    ScrollToLine(nTopLine, TRUE);
}

void CBaseView::ScrollToLine(int nNewTopLine, BOOL bTrackScrollBar /*= TRUE*/)
{
    if (m_nTopLine != nNewTopLine)
    {
        if (nNewTopLine < 0)
            nNewTopLine = 0;

        int nScrollLines = m_nTopLine - nNewTopLine;

        m_nTopLine = nNewTopLine;
        CRect rcScroll;
        GetClientRect(&rcScroll);
        rcScroll.top += GetLineHeight() + HEADERHEIGHT;
        ScrollWindow(0, nScrollLines * GetLineHeight(), &rcScroll, &rcScroll);
        UpdateWindow();
        if (bTrackScrollBar)
            RecalcVertScrollBar(TRUE);
        UpdateCaret();
    }
}

void CBaseView::DrawMargin(CDC* pdc, const CRect& rect, int nLineIndex)
{
    pdc->FillSolidRect(rect, CTheme::Instance().GetThemeColor(::GetSysColor(COLOR_SCROLLBAR)));

    if ((nLineIndex >= 0) && (m_pViewData) && (m_pViewData->GetCount()))
    {
        int   nViewLine = GetViewLineForScreen(nLineIndex);
        HICON icon      = nullptr;
        ASSERT(nViewLine < static_cast<int>(m_screenedViewLine.size()));
        TScreenedViewLine::EIcon eIcon = m_screenedViewLine[nViewLine].eIcon;
        if (eIcon == TScreenedViewLine::ICN_UNKNOWN)
        {
            DiffStates state = m_pViewData->GetState(nViewLine);
            switch (state)
            {
                case DIFFSTATE_ADDED:
                case DIFFSTATE_THEIRSADDED:
                case DIFFSTATE_YOURSADDED:
                case DIFFSTATE_IDENTICALADDED:
                case DIFFSTATE_CONFLICTADDED:
                    eIcon = TScreenedViewLine::ICN_ADD;
                    break;
                case DIFFSTATE_REMOVED:
                case DIFFSTATE_THEIRSREMOVED:
                case DIFFSTATE_YOURSREMOVED:
                case DIFFSTATE_IDENTICALREMOVED:
                    eIcon = TScreenedViewLine::ICN_REMOVED;
                    break;
                case DIFFSTATE_CONFLICTED:
                    eIcon = TScreenedViewLine::ICN_CONFLICT;
                    break;
                case DIFFSTATE_CONFLICTED_IGNORED:
                    eIcon = TScreenedViewLine::ICN_CONFLICTIGNORED;
                    break;
                case DIFFSTATE_EDITED:
                    eIcon = TScreenedViewLine::ICN_EDIT;
                    break;
                default:
                    break;
            }
            bool bIdentical = false;
            int  blockStart = -1;
            int  blockEnd   = -1;
            if ((state != DIFFSTATE_EDITED) && (IsBlockWhitespaceOnly(nLineIndex, bIdentical, blockStart, blockEnd)))
            {
                if (bIdentical)
                    eIcon = TScreenedViewLine::ICN_SAME;
                else
                    eIcon = TScreenedViewLine::ICN_WHITESPACEDIFF;
                if (((blockStart >= 0) && (blockEnd >= 0)) && (blockStart < blockEnd))
                {
                    if (nViewLine > blockStart)
                        Invalidate(); // redraw the upper icons since they're now changing
                    while (blockStart <= blockEnd)
                        m_screenedViewLine[blockStart++].eIcon = eIcon;
                }
            }
            if (m_pViewData->GetMovedIndex(nViewLine) >= 0)
                eIcon = TScreenedViewLine::ICN_MOVED;
            if (m_pViewData->GetMarked(nViewLine))
                eIcon = TScreenedViewLine::ICN_MARKED;
            m_screenedViewLine[nViewLine].eIcon = eIcon;
        }
        switch (eIcon)
        {
            case TScreenedViewLine::ICN_UNKNOWN:
            case TScreenedViewLine::ICN_NONE:
                break;
            case TScreenedViewLine::ICN_SAME:
                icon = m_hEqualIcon;
                break;
            case TScreenedViewLine::ICN_EDIT:
                icon = m_hEditedIcon;
                break;
            case TScreenedViewLine::ICN_WHITESPACEDIFF:
                icon = m_hWhitespaceBlockIcon;
                break;
            case TScreenedViewLine::ICN_ADD:
                icon = m_hAddedIcon;
                break;
            case TScreenedViewLine::ICN_CONFLICT:
                icon = m_hConflictedIcon;
                break;
            case TScreenedViewLine::ICN_CONFLICTIGNORED:
                icon = m_hConflictedIgnoredIcon;
                break;
            case TScreenedViewLine::ICN_REMOVED:
                icon = m_hRemovedIcon;
                break;
            case TScreenedViewLine::ICN_MOVED:
                icon = m_hMovedIcon;
                break;
            case TScreenedViewLine::ICN_MARKED:
                icon = m_hMarkedIcon;
                break;
        }

        int iconWidth  = GetSystemMetrics(SM_CXSMICON);
        int iconHeight = GetSystemMetrics(SM_CYSMICON);
        if (icon)
        {
            ::DrawIconEx(pdc->m_hDC, rect.left + CDPIAware::Instance().Scale(GetSafeHwnd(), 2), rect.top + (rect.Height() - iconHeight) / 2, icon, iconWidth, iconHeight, 0, nullptr, DI_NORMAL);
        }
        if ((m_bViewLinenumbers) && (m_nDigits))
        {
            int     nSubLine        = GetSubLineOffset(nLineIndex);
            bool    bIsFirstSubline = (nSubLine == 0) || (nSubLine == -1);
            CString sLineNumber;
            if (bIsFirstSubline)
            {
                CString sLineNumberFormat;
                int     nLineNumber = GetLineNumber(nLineIndex);
                if (IsViewLineHidden(GetViewLineForScreen(nLineIndex)))
                {
                    // TODO: do not show if there is no number hidden
                    // TODO: show number if there is only one
                    sLineNumberFormat.Format(L"%%%ds", m_nDigits);
                    sLineNumber.Format(sLineNumberFormat, (m_nDigits > 1) ? L"↕⁞" : L"⁞"); // alternative …
                }
                else if (nLineNumber >= 0)
                {
                    sLineNumberFormat.Format(L"%%%dd", m_nDigits);
                    sLineNumber.Format(sLineNumberFormat, nLineNumber + 1);
                }
                else if (m_pMainFrame->m_bWrapLines)
                {
                    sLineNumberFormat.Format(L"%%%ds", m_nDigits);
                    sLineNumber.Format(sLineNumberFormat, L"·");
                }
                if (!sLineNumber.IsEmpty())
                {
                    pdc->SetBkColor(CTheme::Instance().GetThemeColor(::GetSysColor(COLOR_SCROLLBAR)));
                    pdc->SetTextColor(CTheme::Instance().IsDarkTheme() ? CTheme::darkTextColor : GetSysColor(COLOR_WINDOWTEXT));

                    pdc->SelectObject(GetFont());
                    pdc->ExtTextOut(rect.left + iconWidth + CDPIAware::Instance().Scale(GetSafeHwnd(), 2), rect.top, ETO_CLIPPED, &rect, sLineNumber, nullptr);
                }
            }
        }
    }
}

int CBaseView::GetMarginWidth()
{
    int marginWidth = GetSystemMetrics(SM_CXSMICON) + CDPIAware::Instance().Scale(GetSafeHwnd(), 4);

    if ((m_bViewLinenumbers) && (m_pViewData) && (m_pViewData->GetCount()))
    {
        if (m_nDigits <= 0)
        {
            int nLength = static_cast<int>(m_pViewData->GetCount());
            // find out how many digits are needed to show the highest line number
            CString sMax;
            sMax.Format(L"%d", nLength);
            m_nDigits = sMax.GetLength();
        }
        int nWidth = GetCharWidth();
        marginWidth += (m_nDigits * nWidth) + CDPIAware::Instance().Scale(GetSafeHwnd(), 2);
    }

    return marginWidth;
}

void CBaseView::DrawHeader(CDC* pdc, const CRect& rect)
{
    CRect    textrect(rect.left, rect.top, rect.Width(), GetLineHeight() + HEADERHEIGHT);
    COLORREF crBk, crFg;
    if (IsBottomViewGood())
    {
        CDiffColors::GetInstance().GetColors(DIFFSTATE_NORMAL, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBk, crFg);
        crBk = CTheme::Instance().GetThemeColor(::GetSysColor(COLOR_SCROLLBAR));
    }
    else
    {
        DiffStates state = DIFFSTATE_REMOVED;
        if (this == m_pwndRight)
        {
            state = DIFFSTATE_ADDED;
        }
        CDiffColors::GetInstance().GetColors(state, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBk, crFg);
    }
    pdc->SetBkColor(crBk);
    pdc->FillSolidRect(textrect, crBk);

    pdc->SetTextColor(crFg);

    pdc->SelectObject(GetFont(FALSE, TRUE));

    CString sViewTitle;
    if (IsModified())
    {
        sViewTitle = L"* " + m_sWindowName;
    }
    else
    {
        sViewTitle = m_sWindowName;
    }
    int nStringLength = (GetCharWidth() * m_sWindowName.GetLength());
    if (nStringLength > rect.Width())
    {
        int offset = std::min<int>(m_nOffsetChar, (nStringLength - rect.Width()) / GetCharWidth() + 1);
        sViewTitle = m_sWindowName.Mid(offset);
    }
    RECT titleRC = textrect;
    titleRC.left = std::max<int>(rect.left + (rect.Width() - nStringLength) / 2, 1);
    titleRC.top  = rect.top + (HEADERHEIGHT / 2);
    pdc->DrawText(sViewTitle, &titleRC, DT_HIDEPREFIX | DT_NOPREFIX | DT_SINGLELINE);
    if (this->GetFocus() == this)
        pdc->DrawEdge(textrect, EDGE_BUMP, BF_RECT);
    else
        pdc->DrawEdge(textrect, EDGE_ETCHED, BF_RECT);
}

void CBaseView::OnDraw(CDC* pDC)
{
    CRect rcClient;
    GetClientRect(rcClient);

    int nLineCount  = GetLineCount();
    int nLineHeight = GetLineHeight();

    CDC cacheDC;
    VERIFY(cacheDC.CreateCompatibleDC(pDC));
    if (!m_pCacheBitmap)
    {
        m_pCacheBitmap = new CBitmap;
        VERIFY(m_pCacheBitmap->CreateCompatibleBitmap(pDC, rcClient.Width(), nLineHeight));
    }
    CBitmap* pOldBitmap = cacheDC.SelectObject(m_pCacheBitmap);

    DrawHeader(pDC, rcClient);

    CRect rcLine = rcClient;
    rcLine.top += nLineHeight + HEADERHEIGHT;
    rcLine.bottom = rcLine.top + nLineHeight;
    CRect rcCacheMargin(0, 0, GetMarginWidth(), nLineHeight);
    CRect rcCacheLine(GetMarginWidth(), 0, rcLine.Width(), nLineHeight);

    int  nCurrentLine          = m_nTopLine;
    bool bBeyondFileLineCached = false;
    while (rcLine.top < rcClient.bottom)
    {
        if (nCurrentLine < nLineCount)
        {
            DrawMargin(&cacheDC, rcCacheMargin, nCurrentLine);
            DrawSingleLine(&cacheDC, rcCacheLine, nCurrentLine);
            bBeyondFileLineCached = false;
        }
        else if (!bBeyondFileLineCached)
        {
            DrawMargin(&cacheDC, rcCacheMargin, -1);
            DrawSingleLine(&cacheDC, rcCacheLine, -1);
            bBeyondFileLineCached = true;
        }

        VERIFY(pDC->BitBlt(rcLine.left, rcLine.top, rcLine.Width(), rcLine.Height(), &cacheDC, 0, 0, SRCCOPY));

        nCurrentLine++;
        rcLine.OffsetRect(0, nLineHeight);
    }

    cacheDC.SelectObject(pOldBitmap);
    cacheDC.DeleteDC();
}

bool CBaseView::IsStateConflicted(DiffStates state)
{
    switch (state)
    {
        case DIFFSTATE_CONFLICTED:
        case DIFFSTATE_CONFLICTED_IGNORED:
        case DIFFSTATE_CONFLICTEMPTY:
        case DIFFSTATE_CONFLICTADDED:
            return true;
        default:
            break;
    }
    return false;
}

bool CBaseView::IsStateEmpty(DiffStates state)
{
    switch (state)
    {
        case DIFFSTATE_CONFLICTEMPTY:
        case DIFFSTATE_UNKNOWN:
        case DIFFSTATE_EMPTY:
            return true;
        default:
            break;
    }
    return false;
}

bool CBaseView::IsStateRemoved(DiffStates state)
{
    switch (state)
    {
        case DIFFSTATE_REMOVED:
        case DIFFSTATE_THEIRSREMOVED:
        case DIFFSTATE_YOURSREMOVED:
        case DIFFSTATE_IDENTICALREMOVED:
            return true;
        default:
            break;
    }
    return false;
}

DiffStates CBaseView::ResolveState(DiffStates state)
{
    if (IsStateConflicted(state))
    {
        if (state == DIFFSTATE_CONFLICTEMPTY)
            return DIFFSTATE_CONFLICTRESOLVEDEMPTY;
        else
            return DIFFSTATE_CONFLICTRESOLVED;
    }
    return state;
}

bool CBaseView::IsLineEmpty(int nLineIndex) const
{
    if (m_pViewData == nullptr)
        return FALSE;
    int nViewLine = GetViewLineForScreen(nLineIndex);
    return IsViewLineEmpty(nViewLine);
}

bool CBaseView::IsViewLineEmpty(int nViewLine) const
{
    if (m_pViewData == nullptr)
        return FALSE;
    const DiffStates state = m_pViewData->GetState(nViewLine);
    return IsStateEmpty(state);
}

bool CBaseView::IsLineRemoved(int nLineIndex) const
{
    if (m_pViewData == nullptr)
        return FALSE;
    int nViewLine = GetViewLineForScreen(nLineIndex);
    return IsViewLineRemoved(nViewLine);
}

bool CBaseView::IsViewLineRemoved(int nViewLine) const
{
    if (m_pViewData == nullptr)
        return FALSE;
    const DiffStates state = m_pViewData->GetState(nViewLine);
    return IsStateRemoved(state);
}

COLORREF CBaseView::InlineDiffColor(int nLineIndex) const
{
    if (m_bDark)
        return IsLineRemoved(nLineIndex) ? m_inlineRemovedDarkBk : m_inlineAddedDarkBk;
    return IsLineRemoved(nLineIndex) ? m_inlineRemovedBk : m_inlineAddedBk;
}

COLORREF CBaseView::InlineViewLineDiffColor(int nViewLine) const
{
    if (m_bDark)
        return IsViewLineRemoved(nViewLine) ? m_inlineRemovedDarkBk : m_inlineAddedDarkBk;
    return IsViewLineRemoved(nViewLine) ? m_inlineRemovedBk : m_inlineAddedBk;
}

void CBaseView::DrawLineEnding(CDC* pDC, const CRect& rc, int nLineIndex, const CPoint& origin)
{
    if (origin.x < (rc.left - GetCharWidth() + 1))
        return;
    if (!(m_bViewWhitespace && m_pViewData && (nLineIndex >= 0) && (nLineIndex < GetLineCount())))
        return;
    int viewLine = GetViewLineForScreen(nLineIndex);
    EOL ending   = m_pViewData->GetLineEnding(viewLine);
    if (m_bIconLFs)
    {
        HICON hEndingIcon = nullptr;
        switch (ending)
        {
            case EOL_CR:
                hEndingIcon = m_hLineEndingCR;
                break;
            case EOL_CRLF:
                hEndingIcon = m_hLineEndingCRLF;
                break;
            case EOL_LF:
                hEndingIcon = m_hLineEndingLF;
                break;
            default:
                return;
        }
        // If EOL style has changed, color end-of-line markers as inline differences.
        if (
            m_bShowInlineDiff && m_pOtherViewData &&
            (viewLine < m_pOtherViewData->GetCount()) &&
            (ending != EOL_NOENDING) &&
            (ending != m_pOtherViewData->GetLineEnding(viewLine) &&
             (m_pOtherViewData->GetLineEnding(viewLine) != EOL_NOENDING)))
        {
            pDC->FillSolidRect(origin.x, origin.y, rc.Height(), rc.Height(), InlineDiffColor(nLineIndex));
        }

        DrawIconEx(pDC->GetSafeHdc(), origin.x, origin.y, hEndingIcon, rc.Height(), rc.Height(), 0, nullptr, DI_NORMAL);
    }
    else
    {
        CPen  pen(PS_SOLID, 0, CTheme::Instance().GetThemeColor(m_whiteSpaceFg));
        CPen* oldpen     = pDC->SelectObject(&pen);
        int   yMiddle    = origin.y + rc.Height() / 2;
        int   xMiddle    = origin.x + GetCharWidth() / 2;
        bool  bMultiline = false;
        auto  onePix     = CDPIAware::Instance().Scale(GetSafeHwnd(), 1);
        auto  twoPix     = CDPIAware::Instance().Scale(GetSafeHwnd(), 2);
        auto  fourPix    = CDPIAware::Instance().Scale(GetSafeHwnd(), 4);
        auto  fivePix    = CDPIAware::Instance().Scale(GetSafeHwnd(), 5);
        if ((static_cast<int>(m_screen2View.size()) > nLineIndex + 1) && (GetViewLineForScreen(nLineIndex + 1) == viewLine))
        {
            if (GetLineLength(nLineIndex + 1))
            {
                // multiline
                bMultiline = true;
                pDC->MoveTo(origin.x, yMiddle - twoPix);
                pDC->LineTo(origin.x + GetCharWidth() - onePix, yMiddle - twoPix);
                pDC->LineTo(origin.x + GetCharWidth() - onePix, yMiddle + twoPix);
                pDC->LineTo(origin.x, yMiddle + twoPix);
            }
            else if (GetLineLength(nLineIndex) == 0)
                bMultiline = true;
        }
        else if ((nLineIndex > 0) && (GetViewLineForScreen(nLineIndex - 1) == viewLine) && (GetLineLength(nLineIndex) == 0))
            bMultiline = true;

        if (!bMultiline)
        {
            switch (ending)
            {
                case EOL_AUTOLINE:
                case EOL_CRLF:
                    // arrow from top to middle+2, then left
                    pDC->MoveTo(origin.x + GetCharWidth() - onePix, rc.top + onePix);
                    pDC->LineTo(origin.x + GetCharWidth() - onePix, yMiddle);
                    [[fallthrough]];
                case EOL_CR:
                    // arrow from right to left
                    pDC->MoveTo(origin.x + GetCharWidth() - onePix, yMiddle);
                    pDC->LineTo(origin.x, yMiddle);
                    pDC->LineTo(origin.x + fourPix, yMiddle + fourPix);
                    pDC->MoveTo(origin.x, yMiddle);
                    pDC->LineTo(origin.x + fourPix, yMiddle - fourPix);
                    break;
                case EOL_LFCR:
                    // from right-upper to left then down
                    pDC->MoveTo(origin.x + GetCharWidth() - onePix, yMiddle - twoPix);
                    pDC->LineTo(xMiddle, yMiddle - twoPix);
                    pDC->LineTo(xMiddle, rc.bottom - onePix);
                    pDC->LineTo(xMiddle + fourPix, rc.bottom - fivePix);
                    pDC->MoveTo(xMiddle, rc.bottom - onePix);
                    pDC->LineTo(xMiddle - fourPix, rc.bottom - fivePix);
                    break;
                case EOL_LF:
                    // arrow from top to bottom
                    pDC->MoveTo(xMiddle, rc.top);
                    pDC->LineTo(xMiddle, rc.bottom - onePix);
                    pDC->LineTo(xMiddle + fourPix, rc.bottom - fivePix);
                    pDC->MoveTo(xMiddle, rc.bottom - onePix);
                    pDC->LineTo(xMiddle - fourPix, rc.bottom - fivePix);
                    break;
                case EOL_FF:  // Form Feed, U+000C
                case EOL_NEL: // Next Line, U+0085
                case EOL_LS:  // Line Separator, U+2028
                case EOL_PS:  // Paragraph Separator, U+2029
                    // draw a horizontal line at the bottom of this line
                    pDC->FillSolidRect(rc.left, rc.bottom - 1, rc.right, rc.bottom, CTheme::Instance().IsDarkTheme() ? CTheme::darkTextColor : GetSysColor(COLOR_WINDOWTEXT));
                    pDC->MoveTo(origin.x + GetCharWidth() - 1, rc.bottom - GetCharWidth() - 2);
                    pDC->LineTo(origin.x, rc.bottom - 2);
                    pDC->LineTo(origin.x + 5, rc.bottom - 2);
                    pDC->MoveTo(origin.x, rc.bottom - 2);
                    pDC->LineTo(origin.x + 1, rc.bottom - 6);
                    break;
                default: // other EOLs
                    // arrow from top right to bottom left
                    pDC->MoveTo(origin.x + GetCharWidth() - 1, rc.bottom - GetCharWidth());
                    pDC->LineTo(origin.x, rc.bottom - 1);
                    pDC->LineTo(origin.x + 5, rc.bottom - 2);
                    pDC->MoveTo(origin.x, rc.bottom - 1);
                    pDC->LineTo(origin.x + 1, rc.bottom - 6);
                    break;
                case EOL_NOENDING:
                    break;
            }
        }
        pDC->SelectObject(oldpen);
    }
}

void CBaseView::DrawBlockLine(CDC* pDC, const CRect& rc, int nLineIndex) const
{
    if (!m_bShowSelection)
        return;

    int nSelBlockStart;
    int nSelBlockEnd;
    if (!GetViewSelection(nSelBlockStart, nSelBlockEnd))
        return;

    const int THICKNESS = 2;
    COLORREF  rectcol   = 0;
    if (m_bFocused)
        rectcol = CTheme::Instance().IsDarkTheme() ? CTheme::darkTextColor : GetSysColor(COLOR_WINDOWTEXT);
    else
        rectcol = CTheme::Instance().GetThemeColor(GetSysColor(COLOR_GRAYTEXT));

    int  nViewLineIndex       = GetViewLineForScreen(nLineIndex);
    int  nSubLine             = GetSubLineOffset(nLineIndex);
    bool bFirstLineOfViewLine = (nSubLine == 0 || nSubLine == -1);
    if ((nViewLineIndex == nSelBlockStart) && bFirstLineOfViewLine)
    {
        pDC->FillSolidRect(rc.left, rc.top, rc.Width(), THICKNESS, rectcol);
    }

    bool bLastLineOfViewLine = (nLineIndex + 1 == m_screen2View.size()) || (GetViewLineForScreen(nLineIndex) != GetViewLineForScreen(nLineIndex + 1));
    if ((nViewLineIndex == nSelBlockEnd) && bLastLineOfViewLine)
    {
        pDC->FillSolidRect(rc.left, rc.bottom - THICKNESS, rc.Width(), THICKNESS, rectcol);
    }
}

void CBaseView::DrawTextLine(
    CDC* pDC, const CRect& rc, int nLineIndex, POINT& coords)
{
    ASSERT(nLineIndex < GetLineCount());
    int nViewLine = GetViewLineForScreen(nLineIndex);
    ASSERT(m_pViewData && (nViewLine < m_pViewData->GetCount()));

    CRgn rgn;
    rgn.CreateRectRgn(rc.left, rc.top, rc.right, rc.bottom);
    pDC->SelectClipRgn(&rgn);
    OnOutOfScope(pDC->SelectClipRgn(nullptr));
    LineColors lineCols = GetLineColors(nViewLine);

    CString sViewLine = GetViewLineChars(nViewLine);
    // mark selection
    if (m_bShowSelection && HasTextSelection())
    {
        // has this line selection ?
        if ((m_ptSelectionViewPosStart.y <= nViewLine) && (nViewLine <= m_ptSelectionViewPosEnd.y))
        {
            int nViewLineLength = sViewLine.GetLength();

            // first suppose the whole line is selected
            int selectedStart = 0;
            int selectedEnd   = nViewLineLength;

            // the view line is partially selected
            if (m_ptSelectionViewPosStart.y == nViewLine)
            {
                selectedStart = m_ptSelectionViewPosStart.x;
            }

            if (m_ptSelectionViewPosEnd.y == nViewLine)
            {
                selectedEnd = m_ptSelectionViewPosEnd.x;
            }
            // apply selection coloring
            // First enforce start and end point
            lineCols.SplitBlock(selectedStart);
            lineCols.SplitBlock(selectedEnd);
            // change color of affected parts
            long intenseColorScale = m_bFocused ? 70 : 30;
            for (auto it = lineCols.lower_bound(selectedStart); it != lineCols.end() && it->first < selectedEnd; ++it)
            {
                auto&    second = it->second;
                COLORREF crBk   = CAppUtils::IntenseColor(intenseColorScale, second.background);
                if (second.shot == second.background)
                {
                    second.shot = crBk;
                }
                second.background = crBk;
                second.text       = CAppUtils::IntenseColor(intenseColorScale, second.text);
            }
        }
    }

    // TODO: remove duplicate from selection and mark
    if (!m_sMarkedWord.IsEmpty())
    {
        int nMarkLength = m_sMarkedWord.GetLength();
        //int nViewLineLength = sViewLine.GetLength();
        const wchar_t* text     = sViewLine;
        const wchar_t* findText = text;
        while ((findText = wcsstr(findText, m_sMarkedWord)) != nullptr)
        {
            int nMarkStart = static_cast<int>(findText - text);
            int nMarkEnd   = nMarkStart + nMarkLength;
            findText += nMarkLength;
            ECharGroup eLeft  = GetCharGroup(sViewLine, nMarkStart - 1);
            ECharGroup eStart = GetCharGroup(sViewLine, nMarkStart);
            if (eLeft == eStart)
                continue;
            ECharGroup eRight = GetCharGroup(sViewLine, nMarkEnd);
            ECharGroup eEnd   = GetCharGroup(sViewLine, nMarkEnd - 1);
            if (eRight == eEnd)
                continue;

            // First enforce start and end point
            lineCols.SplitBlock(nMarkStart);
            lineCols.SplitBlock(nMarkEnd);
            // change color of affected parts
            const long int nIntenseColorScale = 200;
            for (std::map<int, linecolors_t>::iterator it = lineCols.lower_bound(nMarkStart); it != lineCols.end() && it->first < nMarkEnd; ++it)
            {
                auto&    second = it->second;
                COLORREF crBk   = CAppUtils::IntenseColor(nIntenseColorScale, second.background);
                if (second.shot == second.background)
                {
                    second.shot = crBk;
                }
                second.background = crBk;
                second.text       = CAppUtils::IntenseColor(nIntenseColorScale, second.text);
                if (CTheme::Instance().IsDarkTheme())
                {
                    int bkGray = (static_cast<int>(GetRValue(crBk)) + GetGValue(crBk) + GetBValue(crBk)) / 3;
                    int frGray = (static_cast<int>(GetRValue(second.text)) + GetGValue(second.text) + GetBValue(second.text)) / 3;
                    if (abs(bkGray - frGray) < 100)
                        second.text = CAppUtils::IntenseColor(nIntenseColorScale, second.text);
                    ;
                }
            }
        }
    }
    if (!m_sFindText.IsEmpty())
    {
        int     nMarkStart = 0;
        int     nMarkEnd   = 0;
        int     nStringPos = nMarkStart;
        CString searchLine = sViewLine;
        if (!m_bMatchCase)
            searchLine.MakeLower();
        while (StringFound(searchLine, SearchNext, nMarkStart, nMarkEnd) != 0)
        {
            // First enforce start and end point
            lineCols.SplitBlock(nMarkStart + nStringPos);
            lineCols.SplitBlock(nMarkEnd + nStringPos);
            // change color of affected parts
            const long int nIntenseColorScale = 30;
            for (std::map<int, linecolors_t>::iterator it = lineCols.lower_bound(nMarkStart + nStringPos); it != lineCols.end() && it->first < nMarkEnd + nStringPos; ++it)
            {
                auto&    second = it->second;
                COLORREF crBk   = CAppUtils::IntenseColor(nIntenseColorScale, second.background);
                if (second.shot == second.background)
                {
                    second.shot = crBk;
                }
                second.background = crBk;
                second.text       = CAppUtils::IntenseColor(nIntenseColorScale, second.text);
            }
            searchLine = searchLine.Mid(nMarkEnd);
            nStringPos += nMarkEnd;
            nMarkStart = 0;
            nMarkEnd   = 0;
        }
    }

    // @ this point we may cache data for next line which may be same in wrapped mode

    int nTextOffset = 0;
    int nSubline    = GetSubLineOffset(nLineIndex);
    for (int n = 0; n < nSubline; n++)
    {
        CString sLine = m_screenedViewLine[nViewLine].m_subLines[n];
        nTextOffset += sLine.GetLength();
    }

    CString sLine       = GetLineChars(nLineIndex);
    int     nLineLength = sLine.GetLength();
    CString sLineExp    = ExpandChars(sLine);
    LPCWSTR textExp     = sLineExp;
    //int nLineLengthExp = sLineExp.GetLength();
    int nStartExp = 0;
    int nLeft     = coords.x;
    for (std::map<int, linecolors_t>::const_iterator itStart = lineCols.begin(); itStart != lineCols.end(); ++itStart)
    {
        std::map<int, linecolors_t>::const_iterator itEnd = itStart;
        ++itEnd;
        int nStart = std::max<int>(0, itStart->first - nTextOffset);
        int nEnd   = nLineLength;
        if (itEnd != lineCols.end())
        {
            nEnd = std::min<int>(nEnd, itEnd->first - nTextOffset);
        }
        int nBlockLength = nEnd - nStart;
        if (nBlockLength > 0 && nEnd >= 0)
        {
            auto& second = itStart->second;
            pDC->SetBkColor(second.background);
            pDC->SetTextColor(second.text);
            int     nEndExp     = CountExpandedChars(sLine, nEnd);
            int     nTextLength = nEndExp - nStartExp;
            LPCWSTR pZBlockText = textExp + nStartExp;
            SIZE    size{};
            GetTextExtentPoint32(pDC->GetSafeHdc(), pZBlockText, nTextLength, &size); // falls time-2-tme
            int nRight = nLeft + size.cx;
            if ((nRight > rc.left) && (nLeft < rc.right))
            {
                // note: ExtTextOut has a limit for the length of the string. That limit is supposed
                // to be 8192, but that's not really true: I found that the limit (at least on my machine and a few others)
                // is 4094 (4095 doesn't work anymore).
                // So we limit the length here to that 4094 chars.
                // In case we're scrolled to the right, there's no need to draw the string
                // from way outside our window, so we also offset the drawing to the start of the window.
                // This reduces the string length as well.
                int offset    = 0;
                int leftcoord = nLeft;
                if (nLeft < 0)
                {
                    int  fit       = nTextLength;
                    auto posBuffer = std::make_unique<int[]>(fit);
                    GetTextExtentExPoint(pDC->GetSafeHdc(), pZBlockText, nTextLength, INT_MAX, &fit, posBuffer.get(), &size);
                    int lower = 0, upper = fit - 1;
                    do
                    {
                        int middle = (upper + lower + 1) / 2;
                        int width  = posBuffer.get()[middle];
                        if (rc.left - nLeft < width)
                            upper = middle - 1;
                        else
                            lower = middle;
                    } while (lower < upper);

                    offset = lower;
                    nTextLength -= offset;
                    leftcoord += lower > 0 ? posBuffer.get()[lower - 1] : 0;
                }

                RECT drawRC = rc;
                drawRC.left = leftcoord;
                drawRC.top  = coords.y;
                pDC->DrawText(pZBlockText + offset, min(nTextLength, 4094), &drawRC, DT_HIDEPREFIX | DT_NOPREFIX | DT_SINGLELINE);
                if ((second.shot != second.background) && (itStart->first == nStart + nTextOffset))
                {
                    pDC->FillSolidRect(nLeft - 1, rc.top, 1, rc.Height(), second.shot);
                }
            }
            nLeft     = nRight;
            coords.x  = nRight;
            nStartExp = nEndExp;
        }
    }
}

void CBaseView::DrawSingleLine(CDC* pDC, const CRect& rc, int nLineIndex)
{
    if (nLineIndex >= GetLineCount())
        nLineIndex = -1;
    ASSERT(nLineIndex >= -1);

    if ((nLineIndex == -1) || !m_pViewData)
    {
        // Draw line beyond the text
        COLORREF crBkgnd{}, crText{};
        CDiffColors::GetInstance().GetColors(DIFFSTATE_UNKNOWN, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBkgnd, crText);
        pDC->FillSolidRect(rc, crBkgnd);
        return;
    }

    int viewLine = GetViewLineForScreen(nLineIndex);
    if (m_pMainFrame->m_bCollapsed)
    {
        if (m_pViewData->GetHideState(viewLine) == HIDESTATE_MARKER)
        {
            COLORREF crBkgnd{}, crText{};
            CDiffColors::GetInstance().GetColors(DIFFSTATE_UNKNOWN, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBkgnd, crText);
            pDC->FillSolidRect(rc, crBkgnd);

            const int THICKNESS = 2;
            COLORREF  rectCol   = CTheme::Instance().IsDarkTheme() ? CTheme::darkTextColor : GetSysColor(COLOR_WINDOWTEXT);
            pDC->FillSolidRect(rc.left, rc.top + (rc.Height() / 2), rc.Width(), THICKNESS, rectCol);
            pDC->SetTextColor(CTheme::Instance().GetThemeColor(GetSysColor(COLOR_GRAYTEXT)));
            pDC->SetBkColor(crBkgnd);
            CRect rect = rc;
            pDC->DrawText(L"{...}", &rect, DT_NOPREFIX | DT_SINGLELINE | DT_CENTER);
            return;
        }
    }

    DiffStates diffState = m_pViewData->GetState(viewLine);
    COLORREF   crBkgnd, crText;
    CDiffColors::GetInstance().GetColors(diffState, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBkgnd, crText);
    if (diffState == DIFFSTATE_CONFLICTED)
    {
        // conflicted lines are shown without 'text' on them
        CRect rect = rc;
        pDC->FillSolidRect(rc, crBkgnd);
        // now draw some faint text patterns
        pDC->SetTextColor(CAppUtils::IntenseColor(130, crBkgnd));
        pDC->DrawText(m_sConflictedText, rect, DT_LEFT | DT_NOPREFIX | DT_SINGLELINE);
        DrawBlockLine(pDC, rc, nLineIndex);
        return;
    }

    CPoint  origin(rc.left - m_nOffsetChar * GetCharWidth(), rc.top);
    CString sLine = GetLineChars(nLineIndex);
    if (sLine.IsEmpty())
    {
        pDC->FillSolidRect(rc, crBkgnd);
        DrawBlockLine(pDC, rc, nLineIndex);
        DrawLineEnding(pDC, rc, nLineIndex, origin);
        return;
    }

    CheckOtherView();

    // Draw the line

    pDC->SelectObject(GetFont(FALSE, FALSE));

    DrawTextLine(pDC, rc, nLineIndex, origin);

    // draw white space after the end of line
    CRect fRect = rc;
    if (origin.x > fRect.left)
        fRect.left = origin.x;
    if (fRect.right > fRect.left)
        pDC->FillSolidRect(fRect, crBkgnd);

    // draw the whitespace chars
    LPCWSTR pszChars = static_cast<LPCWSTR>(sLine);
    if (m_bViewWhitespace)
    {
        int     xPos       = 0;
        int     nChars     = 0;
        LPCWSTR pLastSpace = pszChars;
        int     y          = rc.top + (rc.bottom - rc.top) / 2;
        xPos -= m_nOffsetChar * GetCharWidth();

        CPen pen(PS_SOLID, 0, CTheme::Instance().GetThemeColor(m_whiteSpaceFg));
        auto twoPix  = CDPIAware::Instance().Scale(GetSafeHwnd(), 2);
        auto fourPix = CDPIAware::Instance().Scale(GetSafeHwnd(), 4);
        auto sixPix  = CDPIAware::Instance().Scale(GetSafeHwnd(), 5);
        while (*pszChars)
        {
            switch (*pszChars)
            {
                case '\t':
                {
                    xPos += pDC->GetTextExtent(pLastSpace, static_cast<int>(pszChars - pLastSpace)).cx;
                    pLastSpace = pszChars + 1;
                    // draw an arrow
                    int nSpaces = GetTabSize() - nChars % GetTabSize();
                    if (xPos + nSpaces * GetCharWidth() > 0)
                    {
                        int xposreal = max(xPos, 0);
                        if ((xposreal > 0) || (nSpaces > 0))
                        {
                            CPen* oldPen = pDC->SelectObject(&pen);
                            pDC->MoveTo(xposreal + rc.left + twoPix, y);
                            pDC->LineTo((xPos + nSpaces * GetCharWidth()) + rc.left - twoPix, y);
                            pDC->LineTo((xPos + nSpaces * GetCharWidth()) + rc.left - sixPix, y - fourPix);
                            pDC->MoveTo((xPos + nSpaces * GetCharWidth()) + rc.left - twoPix, y);
                            pDC->LineTo((xPos + nSpaces * GetCharWidth()) + rc.left - sixPix, y + fourPix);
                            pDC->SelectObject(oldPen);
                        }
                    }
                    xPos += nSpaces * GetCharWidth();
                    nChars += nSpaces;
                }
                break;
                case ' ':
                {
                    xPos += pDC->GetTextExtent(pLastSpace, static_cast<int>(pszChars - pLastSpace)).cx;
                    pLastSpace = pszChars + 1;
                    if (xPos >= 0)
                    {
                        const int cxWhitespace = twoPix;
                        const int cyWhitespace = twoPix;
                        // draw 2-logical pixel rectangle, like Scintilla editor.
                        pDC->FillSolidRect(xPos + rc.left + GetCharWidth() / 2 - cxWhitespace / 2, y,
                                           cxWhitespace, cyWhitespace, CTheme::Instance().GetThemeColor(m_whiteSpaceFg));
                    }
                    xPos += GetCharWidth();
                    nChars++;
                }
                break;
                default:
                    nChars++;
                    break;
            }
            pszChars++;
        }
    }
    DrawBlockLine(pDC, rc, nLineIndex);
    if (origin.x >= rc.left)
        DrawLineEnding(pDC, rc, nLineIndex, origin);
}

void CBaseView::ExpandChars(const CString& sLine, int nOffset, int nCount, CString& line)
{
    if (nCount <= 0)
    {
        line.Empty();
        return;
    }

    int nTabSize = GetTabSize();

    int nActualOffset = CountExpandedChars(sLine, nOffset);

    LPCWSTR pszChars = static_cast<LPCWSTR>(sLine);
    pszChars += nOffset;
    int nLength = nCount;

    int nTabCount = 0;
    for (int i = 0; i < nLength; i++)
    {
        if (pszChars[i] == '\t')
            nTabCount++;
    }

    LPWSTR pszBuf  = line.GetBuffer(nLength + nTabCount * (nTabSize - 1) + 1);
    int    nCurPos = 0;
    if (nTabCount > 0 || m_bViewWhitespace)
    {
        for (int i = 0; i < nLength; i++)
        {
            if (pszChars[i] == '\t')
            {
                int nSpaces = nTabSize - (nActualOffset + nCurPos) % nTabSize;
                while (nSpaces > 0)
                {
                    pszBuf[nCurPos++] = ' ';
                    nSpaces--;
                }
            }
            else
            {
                pszBuf[nCurPos] = pszChars[i];
                nCurPos++;
            }
        }
    }
    else
    {
        memcpy(pszBuf, pszChars, sizeof(wchar_t) * nLength);
        nCurPos = nLength;
    }
    pszBuf[nCurPos] = 0;
    line.ReleaseBuffer();
}

CString CBaseView::ExpandChars(const CString& sLine, int nOffset)
{
    CString sRet;
    int     nLength = sLine.GetLength();
    ExpandChars(sLine, nOffset, nLength, sRet);
    return sRet;
}

int CBaseView::CountExpandedChars(const CString& sLine, int nLength)
{
    int nTabSize = GetTabSize();

    int nActualOffset = 0;
    for (int i = 0; i < nLength; i++)
    {
        if (sLine[i] == '\t')
            nActualOffset += (nTabSize - nActualOffset % nTabSize);
        else
            nActualOffset++;
    }
    return nActualOffset;
}

void CBaseView::ScrollAllToLine(int nNewTopLine, BOOL bTrackScrollBar)
{
    if (m_pwndLeft)
        m_pwndLeft->ScrollToLine(nNewTopLine, bTrackScrollBar);
    if (m_pwndRight)
        m_pwndRight->ScrollToLine(nNewTopLine, bTrackScrollBar);
    if (m_pwndBottom)
        m_pwndBottom->ScrollToLine(nNewTopLine, bTrackScrollBar);
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

void CBaseView::GoToLine(int nNewLine, BOOL bAll)
{
    //almost the same as ScrollAllToLine, but try to put the line in the
    //middle of the view, not on top
    int nNewTopLine = nNewLine - GetScreenLines() / 2;
    if (nNewTopLine < 0)
        nNewTopLine = 0;
    if (nNewTopLine >= static_cast<int>(m_screen2View.size()))
        nNewTopLine = static_cast<int>(m_screen2View.size()) - 1;
    if (bAll)
        ScrollAllToLine(nNewTopLine);
    else
        ScrollToLine(nNewTopLine);
}

// ReSharper disable once CppMemberFunctionMayBeStatic
BOOL CBaseView::OnEraseBkgnd(CDC* /*pDC*/)
{
    return TRUE;
}

int CBaseView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    SecureZeroMemory(&m_lfBaseFont, sizeof(m_lfBaseFont));
    //lstrcpy(m_lfBaseFont.lfFaceName, L"Courier New");
    //lstrcpy(m_lfBaseFont.lfFaceName, L"FixedSys");
    m_lfBaseFont.lfHeight         = 0;
    m_lfBaseFont.lfWeight         = FW_NORMAL;
    m_lfBaseFont.lfItalic         = FALSE;
    m_lfBaseFont.lfCharSet        = DEFAULT_CHARSET;
    m_lfBaseFont.lfOutPrecision   = OUT_DEFAULT_PRECIS;
    m_lfBaseFont.lfClipPrecision  = CLIP_DEFAULT_PRECIS;
    m_lfBaseFont.lfQuality        = DEFAULT_QUALITY;
    m_lfBaseFont.lfPitchAndFamily = DEFAULT_PITCH;

    return 0;
}

void CBaseView::OnDestroy()
{
    CView::OnDestroy();
    DeleteFonts();
    ReleaseBitmap();
}

void CBaseView::OnSize(UINT nType, int cx, int cy)
{
    CView::OnSize(nType, cx, cy);
    ReleaseBitmap();

    m_nScreenLines = -1;
    m_nScreenChars = -1;
    m_nCharWidth   = -1;
    if (m_nLastScreenChars != GetScreenChars())
    {
        auto oldCaretLine = m_ptCaretViewPos.y;
        m_nLastScreenChars = m_nScreenChars;
        BuildAllScreen2ViewVector();
        if (m_pMainFrame && m_pMainFrame->m_bWrapLines)
        {
            ScrollToLine(oldCaretLine, false);
            EnsureCaretVisible();
            // if we're in wrap mode, the line wrapping most likely changed
            // and that means we have to redraw the whole window, not just the
            // scrolled part.
            Invalidate(FALSE);
        }
        else
        {
            // make sure the view header is redrawn
            CRect rcScroll;
            GetClientRect(&rcScroll);
            rcScroll.bottom = GetLineHeight() + HEADERHEIGHT;
            InvalidateRect(&rcScroll, FALSE);
        }
    }
    else
    {
        // make sure the view header is redrawn
        CRect rcScroll;
        GetClientRect(&rcScroll);
        rcScroll.bottom = GetLineHeight() + HEADERHEIGHT;
        InvalidateRect(&rcScroll, FALSE);

        UpdateLocator();
        RecalcVertScrollBar();
        RecalcHorzScrollBar();
    }
    UpdateCaret();
}

BOOL CBaseView::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
    if (m_pwndLeft)
        m_pwndLeft->OnDoMouseWheel(nFlags, zDelta, pt);
    if (m_pwndRight)
        m_pwndRight->OnDoMouseWheel(nFlags, zDelta, pt);
    if (m_pwndBottom)
        m_pwndBottom->OnDoMouseWheel(nFlags, zDelta, pt);
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
    return CView::OnMouseWheel(nFlags, zDelta, pt);
}

// ReSharper disable once CppMemberFunctionMayBeStatic
void CBaseView::OnMouseHWheel(UINT nFlags, short zDelta, CPoint pt)
{
    if (m_pwndLeft)
        m_pwndLeft->OnDoMouseHWheel(nFlags, zDelta, pt);
    if (m_pwndRight)
        m_pwndRight->OnDoMouseHWheel(nFlags, zDelta, pt);
    if (m_pwndBottom)
        m_pwndBottom->OnDoMouseHWheel(nFlags, zDelta, pt);
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

void CBaseView::OnDoMouseWheel(UINT /*nFlags*/, short zDelta, CPoint /*pt*/)
{
    bool bControl = !!(GetKeyState(VK_CONTROL) & 0x8000);
    bool bShift   = !!(GetKeyState(VK_SHIFT) & 0x8000);

    if (bControl || bShift)
    {
        if (m_pMainFrame->m_bWrapLines)
            return;
        // Ctrl-Wheel scrolls sideways
        ScrollSide(-zDelta / 30);
    }
    else
    {
        ScrollVertical(zDelta);
    }
}

void CBaseView::OnDoMouseHWheel(UINT /*nFlags*/, short zDelta, CPoint /*pt*/)
{
    bool bControl = !!(GetKeyState(VK_CONTROL) & 0x8000);
    bool bShift   = !!(GetKeyState(VK_SHIFT) & 0x8000);

    if (bControl || bShift)
    {
        // Ctrl-H-Wheel scrolls vertical
        ScrollVertical(zDelta);
    }
    else
    {
        if (m_pMainFrame->m_bWrapLines)
            return;
        ScrollSide(zDelta / 30);
    }
}

BOOL CBaseView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
    if (nHitTest == HTCLIENT)
    {
        if ((m_pViewData) && (m_pMainFrame->m_bCollapsed))
        {
            if (m_nMouseLine < static_cast<int>(m_screen2View.size()))
            {
                if (m_nMouseLine >= 0)
                {
                    int viewLine = GetViewLineForScreen(m_nMouseLine);
                    if (viewLine < m_pViewData->GetCount())
                    {
                        if (m_pViewData->GetHideState(viewLine) == HIDESTATE_MARKER)
                        {
                            ::SetCursor(::LoadCursor(nullptr, IDC_HAND));
                            return TRUE;
                        }
                    }
                }
            }
        }
        if (m_mouseInMargin)
        {
            ::SetCursor(m_margincursor);
            return TRUE;
        }
        if (m_nMouseLine >= 0)
        {
            ::SetCursor(::LoadCursor(nullptr, IDC_IBEAM)); // Set To Edit Cursor
            return TRUE;
        }

        ::SetCursor(::LoadCursor(nullptr, IDC_ARROW)); // Set To Arrow Cursor
        return TRUE;
    }
    return CView::OnSetCursor(pWnd, nHitTest, message);
}

void CBaseView::OnKillFocus(CWnd* pNewWnd)
{
    CView::OnKillFocus(pNewWnd);
    m_bFocused = FALSE;
    UpdateCaret();
    Invalidate();
}

void CBaseView::OnSetFocus(CWnd* pOldWnd)
{
    CView::OnSetFocus(pOldWnd);
    m_bFocused = TRUE;
    UpdateCaret();
    Invalidate();
}

int CBaseView::GetLineFromPoint(CPoint point)
{
    ScreenToClient(&point);
    return (((point.y - HEADERHEIGHT) / GetLineHeight()) + m_nTopLine);
}

void CBaseView::OnContextMenu(CPoint point, DiffStates state)
{
    if (!this->IsWindowVisible())
        return;

    CIconMenu popup;
    if (!popup.CreatePopupMenu())
        return;

    AddContextItems(popup, state);

    CMenu popupEols;
    CMenu popupUnicode;
    int   nEncodingCommandBase = POPUPCOMMAND_LAST;
    int   nEolCommandBase      = nEncodingCommandBase + _countof(uctArray);
    if (IsWritable())
    {
        CString               temp;
        TWhitecharsProperties oWhites = GetWhitecharsProperties();
        temp.LoadString(IDS_EDIT_TAB2SPACE);
        popup.AppendMenu(MF_STRING | (oWhites.hasTabsToConvert ? MF_ENABLED : (MF_DISABLED | MF_GRAYED)), POPUPCOMMAND_TABTOSPACES, temp);
        temp.LoadString(IDS_EDIT_SPACE2TAB);
        popup.AppendMenu(MF_STRING | (oWhites.hasSpacesToConvert ? MF_ENABLED : (MF_DISABLED | MF_GRAYED)), POPUPCOMMAND_SPACESTOTABS, temp);
        temp.LoadString(IDS_EDIT_TRIM);
        popup.AppendMenu(MF_STRING | (oWhites.hasTrailWhiteChars ? MF_ENABLED : (MF_DISABLED | MF_GRAYED)), POPUPCOMMAND_REMOVETRAILWHITES, temp);

        // add eol submenu
        if (!popupEols.CreatePopupMenu())
            return;

        EOL eEolType = GetLineEndings(oWhites.hasMixedEols);
        for (int i = 1; i < _countof(eolArray); i++)
        {
            temp          = GetEolName(eolArray[i]);
            bool bChecked = (eEolType == eolArray[i]);
            popupEols.AppendMenu(MF_STRING | MF_ENABLED | (bChecked ? MF_CHECKED : 0), nEolCommandBase + i, temp);
        }

        temp.LoadString(IDS_VIEWCONTEXTMENU_EOL);
        popup.AppendMenuW(MF_POPUP | MF_ENABLED, reinterpret_cast<UINT_PTR>(popupEols.GetSafeHmenu()), temp);

        // add encoding submenu
        if (!popupUnicode.CreatePopupMenu())
            return;
        for (int i = 0; i < _countof(uctArray); i++)
        {
            temp          = CFileTextLines::GetEncodingName(uctArray[i]);
            bool bChecked = (m_textType == uctArray[i]);
            popupUnicode.AppendMenu(MF_STRING | MF_ENABLED | (bChecked ? MF_CHECKED : 0), nEncodingCommandBase + i, temp);
        }
        temp.LoadString(IDS_VIEWCONTEXTMENU_ENCODING);
        popup.AppendMenuW(MF_POPUP | MF_ENABLED, reinterpret_cast<UINT_PTR>(popupUnicode.GetSafeHmenu()), temp);
    }

    CompensateForKeyboard(point);

    int cmd = popup.TrackPopupMenu(TPM_RETURNCMD | TPM_LEFTALIGN | TPM_NONOTIFY | TPM_RIGHTBUTTON, point.x, point.y, this, nullptr);
    ResetUndoStep();
    if ((cmd >= nEncodingCommandBase) && (cmd < nEncodingCommandBase + static_cast<int>(_countof(uctArray))))
    {
        SetTextType(uctArray[cmd - nEncodingCommandBase]);
    }
    if ((cmd >= nEolCommandBase) && (cmd < nEolCommandBase + static_cast<int>(_countof(eolArray))))
    {
        ReplaceLineEndings(eolArray[cmd - nEolCommandBase]);
        SaveUndoStep();
    }
    switch (cmd)
    {
        // 2-pane view commands; target is right view
        case POPUPCOMMAND_USELEFTBLOCK:
            m_pwndRight->UseLeftBlock();
            break;
        case POPUPCOMMAND_USELEFTFILE:
            m_pwndRight->UseLeftFile();
            break;
        case POPUPCOMMAND_USEBOTHLEFTFIRST:
            m_pwndRight->UseBothLeftFirst();
            break;
        case POPUPCOMMAND_USEBOTHRIGHTFIRST:
            m_pwndRight->UseBothRightFirst();
            break;
        case POPUPCOMMAND_MARKBLOCK:
            m_pwndRight->MarkBlock(true);
            break;
        case POPUPCOMMAND_UNMARKBLOCK:
            m_pwndRight->MarkBlock(false);
            break;
        case POPUPCOMMAND_LEAVEONLYMARKEDBLOCKS:
            m_pwndRight->LeaveOnlyMarkedBlocks();
            break;
        // 2-pane view multiedit commands; target is left view
        case POPUPCOMMAND_PREPENDFROMRIGHT:
            if (!m_pwndLeft->IsReadonly())
                m_pwndLeft->UseBothRightFirst();
            break;
        case POPUPCOMMAND_REPLACEBYRIGHT:
            if (!m_pwndLeft->IsReadonly())
                m_pwndLeft->UseRightBlock();
            break;
        case POPUPCOMMAND_APPENDFROMRIGHT:
            if (!m_pwndLeft->IsReadonly())
                m_pwndLeft->UseBothLeftFirst();
            break;
        case POPUPCOMMAND_USERIGHTFILE:
            m_pwndLeft->UseRightFile();
            break;
        // 3-pane view commands; target is bottom view
        case POPUPCOMMAND_USEYOURANDTHEIRBLOCK:
            m_pwndBottom->UseBothRightFirst();
            break;
        case POPUPCOMMAND_USETHEIRANDYOURBLOCK:
            m_pwndBottom->UseBothLeftFirst();
            break;
        case POPUPCOMMAND_USEYOURBLOCK:
            m_pwndBottom->UseRightBlock();
            break;
        case POPUPCOMMAND_USEYOURFILE:
            m_pwndBottom->UseRightFile();
            break;
        case POPUPCOMMAND_USETHEIRBLOCK:
            m_pwndBottom->UseLeftBlock();
            break;
        case POPUPCOMMAND_USETHEIRFILE:
            m_pwndBottom->UseLeftFile();
            break;
        // copy, cut and paste commands
        case ID_EDIT_COPY:
            OnEditCopy();
            break;
        case ID_EDIT_CUT:
            OnEditCut();
            break;
        case ID_EDIT_PASTE:
            OnEditPaste();
            break;
        // white chars manipulations
        case POPUPCOMMAND_TABTOSPACES:
            ConvertTabToSpaces();
            break;
        case POPUPCOMMAND_SPACESTOTABS:
            Tabularize();
            break;
        case POPUPCOMMAND_REMOVETRAILWHITES:
            RemoveTrailWhiteChars();
            break;
        default:
            return;
    }               // switch (cmd)
    SaveUndoStep(); // all except copy, cut  paste save undo step, but this should not be harmful as step is empty already and thus not saved
}

void CBaseView::OnContextMenu(CWnd* /*pWnd*/, CPoint point)
{
    if (!m_pViewData)
        return;

    CRect rcClient;
    GetClientRect(rcClient);
    CRect textRect(rcClient.left, rcClient.top, rcClient.Width(), m_nLineHeight + HEADERHEIGHT);

    int marginWidth = GetSystemMetrics(SM_CXSMICON) + 2 + 2;
    if ((m_bViewLinenumbers) && (m_pViewData) && (m_pViewData->GetCount()) && (m_nDigits > 0))
    {
        marginWidth += (m_nDigits * m_nCharWidth) + 2;
    }
    CRect borderRect(rcClient.left, rcClient.top + m_nLineHeight + HEADERHEIGHT, marginWidth, rcClient.bottom);

    CPoint ptLocal = point;
    ScreenToClient(&ptLocal);

    if (textRect.PtInRect(ptLocal))
    {
        // inside the header part of the view (showing the filename)
        if (IsViewGood(m_pwndBottom))
        {
            CString temp;
            if (this == m_pwndLeft)
            {
                CIconMenu popup;
                if (!popup.CreatePopupMenu())
                    return;

                temp.LoadString(IDS_HEADER_DIFFLEFTTOBASE);
                popup.AppendMenu(MF_STRING | MF_ENABLED, 10, temp);
                int cmd = popup.TrackPopupMenu(TPM_RETURNCMD | TPM_LEFTALIGN | TPM_NONOTIFY | TPM_RIGHTBUTTON, point.x, point.y, this, nullptr);
                if (cmd == 10)
                {
                    m_pMainFrame->DiffLeftToBase();
                }
            }
            if (this == m_pwndRight)
            {
                CIconMenu popup;
                if (!popup.CreatePopupMenu())
                    return;

                temp.LoadString(IDS_HEADER_DIFFRIGHTTOBASE);
                popup.AppendMenu(MF_STRING | MF_ENABLED, 10, temp);
                int cmd = popup.TrackPopupMenu(TPM_RETURNCMD | TPM_LEFTALIGN | TPM_NONOTIFY | TPM_RIGHTBUTTON, point.x, point.y, this, nullptr);
                if (cmd == 10)
                {
                    m_pMainFrame->DiffRightToBase();
                }
            }
        }

        return;
    }

    if (borderRect.PtInRect(ptLocal))
    {
        // inside the border
        // for the future, in case we want to show a different context menu there some day
    }

    int nViewBlockStart = -1;
    int nViewBlockEnd   = -1;
    GetViewSelection(nViewBlockStart, nViewBlockEnd);
    if ((point.x != -1) || (point.y != -1))
    {
        int nLine = GetLineFromPoint(point) - 1;
        if ((nLine >= 0) && (nLine < m_screen2View.size()))
        {
            int nViewLine = GetViewLineForScreen(nLine);
            if (((nViewLine < nViewBlockStart) || (nViewBlockEnd < nViewLine)))
            {
                ClearSelection(); // Clear text-copy selection

                nViewBlockStart  = nViewLine;
                nViewBlockEnd    = nViewLine;
                DiffStates state = m_pViewData->GetState(nViewLine);
                while (nViewBlockStart > 0)
                {
                    const DiffStates lineState = m_pViewData->GetState(nViewBlockStart - 1);
                    if (!LinesInOneChange(-1, state, lineState))
                        break;
                    nViewBlockStart--;
                }

                while (nViewBlockEnd < (m_pViewData->GetCount() - 1))
                {
                    const DiffStates lineState = m_pViewData->GetState(nViewBlockEnd + 1);
                    if (!LinesInOneChange(1, state, lineState))
                        break;
                    nViewBlockEnd++;
                }

                SetupAllViewSelection(nViewBlockStart, nViewBlockEnd);
                UpdateCaretPosition(SetupPoint(0, nViewLine));
            }
        }
    }

    // FixSelection(); fix selection range
    /*if (m_nSelBlockEnd >= m_pViewData->GetCount())
        m_nSelBlockEnd = m_pViewData->GetCount()-1;//*/

    DiffStates state = DIFFSTATE_UNKNOWN;
    if (GetViewSelection(nViewBlockStart, nViewBlockEnd))
    {
        // find a more 'relevant' state in the selection
        for (int i = nViewBlockStart; i <= nViewBlockEnd; ++i)
        {
            state = m_pViewData->GetState(i);
            if ((state != DIFFSTATE_NORMAL) && (state != DIFFSTATE_UNKNOWN))
                break;
        }
    }
    OnContextMenu(point, state);
}

void CBaseView::RefreshViews()
{
    if (m_pwndLeft)
    {
        m_pwndLeft->UpdateStatusBar();
        m_pwndLeft->UpdateCaret();
        m_pwndLeft->Invalidate();
    }
    if (m_pwndRight)
    {
        m_pwndRight->UpdateStatusBar();
        m_pwndRight->UpdateCaret();
        m_pwndRight->Invalidate();
    }
    if (m_pwndBottom)
    {
        m_pwndBottom->UpdateStatusBar();
        m_pwndBottom->UpdateCaret();
        m_pwndBottom->Invalidate();
    }
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

void CBaseView::GoToFirstDifference()
{
    SetCaretToFirstViewLine();
    SelectNextBlock(1, false, false);
}

void CBaseView::GoToFirstConflict()
{
    SetCaretToFirstViewLine();
    SelectNextBlock(1, true, false);
}

void CBaseView::HighlightViewLines(int nStart, int nEnd /* = -1 */)
{
    ClearSelection();
    SetupAllViewSelection(nStart, max(nStart, nEnd));

    UpdateCaretViewPosition(SetupPoint(0, nStart));
    Invalidate();
}

void CBaseView::SetupAllViewSelection(int start, int end)
{
    SetupViewSelection(m_pwndBottom, start, end);
    SetupViewSelection(m_pwndLeft, start, end);
    SetupViewSelection(m_pwndRight, start, end);
}

void CBaseView::SetupAllSelection(int start, int end)
{
    SetupAllViewSelection(GetViewLineForScreen(start), GetViewLineForScreen(end));
}

//void CBaseView::SetupSelection(CBaseView* view, int start, int end) { }

void CBaseView::SetupSelection(int start, int end)
{
    SetupViewSelection(GetViewLineForScreen(start), GetViewLineForScreen(end));
}

void CBaseView::SetupViewSelection(CBaseView* view, int start, int end)
{
    if (!IsViewGood(view))
        return;
    view->SetupViewSelection(start, end);
}

void CBaseView::SetupViewSelection(int start, int end)
{
    // clear text selection before setting line selection ?
    m_nSelViewBlockStart = start;
    m_nSelViewBlockEnd   = end;
    Invalidate();
}

void CBaseView::OnMergePreviousconflict()
{
    SelectNextBlock(-1, true);
}

void CBaseView::OnMergeNextconflict()
{
    SelectNextBlock(1, true);
}

void CBaseView::OnMergeNextdifference()
{
    SelectNextBlock(1, false);
}

void CBaseView::OnMergePreviousdifference()
{
    SelectNextBlock(-1, false);
}

bool CBaseView::HasNextConflict()
{
    return SelectNextBlock(1, true, true, true);
}

bool CBaseView::HasPrevConflict()
{
    return SelectNextBlock(-1, true, true, true);
}

bool CBaseView::HasNextDiff()
{
    return SelectNextBlock(1, false, true, true);
}

bool CBaseView::HasPrevDiff()
{
    return SelectNextBlock(-1, false, true, true);
}

bool CBaseView::LinesInOneChange(int direction, DiffStates initialLineState, DiffStates currentLineState)
{
    // Checks whether all the adjacent lines starting from the initial line
    // and up to the current line form the single change

    // First of all, if the two lines have identical states, they surely
    // belong to one change.
    if (initialLineState == currentLineState)
        return true;

    // Either we move down and initial line state is "added" or "removed" and
    // current line state is "empty"...
    if (direction > 0)
    {
        if (currentLineState == DIFFSTATE_EMPTY)
        {
            if (initialLineState == DIFFSTATE_ADDED || initialLineState == DIFFSTATE_REMOVED)
                return true;
        }
        if (initialLineState == DIFFSTATE_CONFLICTADDED && currentLineState == DIFFSTATE_CONFLICTEMPTY)
            return true;
    }
    // ...or we move up and initial line state is "empty" and current line
    // state is "added" or "removed".
    if (direction < 0)
    {
        if (initialLineState == DIFFSTATE_EMPTY)
        {
            if (currentLineState == DIFFSTATE_ADDED || currentLineState == DIFFSTATE_REMOVED)
                return true;
        }
        if (initialLineState == DIFFSTATE_CONFLICTEMPTY && currentLineState == DIFFSTATE_CONFLICTADDED)
            return true;
    }
    return false;
}

bool CBaseView::SelectNextBlock(int nDirection, bool bConflict, bool bSkipEndOfCurrentBlock /* = true */, bool dryrun /* = false */)
{
    if (!m_pViewData)
        return false;

    const int linesCount = static_cast<int>(m_screen2View.size());
    if (linesCount == 0)
        return false;

    int nCenterPos = GetCaretPosition().y;
    int nLimit     = -1;
    if (nDirection > 0)
        nLimit = linesCount;

    if (nCenterPos >= linesCount)
        nCenterPos = linesCount - 1;

    if (bSkipEndOfCurrentBlock)
    {
        // Find end of current block
        const DiffStates state = m_pViewData->GetState(GetViewLineForScreen(nCenterPos));
        while (nCenterPos != nLimit)
        {
            const DiffStates lineState = m_pViewData->GetState(GetViewLineForScreen(nCenterPos));
            if (!LinesInOneChange(nDirection, state, lineState))
                break;
            nCenterPos += nDirection;
        }
    }

    // Find next diff/conflict block
    while (nCenterPos != nLimit)
    {
        DiffStates lineState = m_pViewData->GetState(GetViewLineForScreen(nCenterPos));
        if (!bConflict &&
            (lineState != DIFFSTATE_NORMAL) &&
            (lineState != DIFFSTATE_UNKNOWN) &&
            (lineState != DIFFSTATE_FILTEREDDIFF))
        {
            break;
        }
        if (bConflict &&
            ((lineState == DIFFSTATE_CONFLICTADDED) ||
             (lineState == DIFFSTATE_CONFLICTED_IGNORED) ||
             (lineState == DIFFSTATE_CONFLICTED) ||
             (lineState == DIFFSTATE_CONFLICTEMPTY)))
        {
            break;
        }

        nCenterPos += nDirection;
    }
    if (nCenterPos == nLimit)
        return false;
    if (dryrun)
        return (nCenterPos != nLimit);

    // Find end of new block
    DiffStates state          = m_pViewData->GetState(GetViewLineForScreen(nCenterPos));
    int        nBlockEnd      = nCenterPos;
    const int  maxAllowedLine = nLimit - nDirection;
    while (nBlockEnd != maxAllowedLine)
    {
        const int lineIndex = nBlockEnd + nDirection;
        if (lineIndex >= linesCount)
            break;
        DiffStates lineState = m_pViewData->GetState(GetViewLineForScreen(lineIndex));
        if (!LinesInOneChange(nDirection, state, lineState))
            break;
        nBlockEnd += nDirection;
    }

    int nTopPos = nCenterPos - (GetScreenLines() / 2);
    if (nTopPos < 0)
        nTopPos = 0;

    POINT ptCaretPos = {0, nCenterPos};
    SetCaretPosition(ptCaretPos);
    ClearSelection();
    if (nDirection > 0)
        SetupAllSelection(nCenterPos, nBlockEnd);
    else
        SetupAllSelection(nBlockEnd, nCenterPos);

    ScrollAllToLine(nTopPos, FALSE);
    RecalcAllVertScrollBars(TRUE);
    SetCaretToLineStart();
    EnsureCaretVisible();
    OnNavigateNextinlinediff();

    UpdateViewsCaretPosition();
    UpdateCaret();
    ShowDiffLines(nCenterPos);
    return true;
}

BOOL CBaseView::OnToolTipNotify(UINT /*id*/, NMHDR* pNMHDR, LRESULT* pResult)
{
    if (pNMHDR->idFrom != reinterpret_cast<UINT_PTR>(m_hWnd))
        return FALSE;

    CString strTipText = m_sWindowName + L"\r\n" + m_sFullFilePath;

    DWORD  pos = GetMessagePos();
    CPoint point(GET_X_LPARAM(pos), GET_Y_LPARAM(pos));
    ScreenToClient(&point);
    const int nLine = GetButtonEventLineIndex(point);

    if (nLine >= 0)
    {
        int nViewLine = GetViewLineForScreen(nLine);
        if ((m_pViewData) && (nViewLine < m_pViewData->GetCount()))
        {
            auto movedIndex = m_pViewData->GetMovedIndex(nViewLine);
            if (movedIndex >= 0)
            {
                if (m_pViewData->IsMovedFrom(nViewLine))
                {
                    strTipText.Format(IDS_MOVED_TO_TT, movedIndex + 1);
                }
                else
                {
                    strTipText.Format(IDS_MOVED_FROM_TT, movedIndex + 1);
                }
            }
        }
    }

    *pResult = 0;
    if (strTipText.IsEmpty())
        return TRUE;

    // need to handle both ANSI and UNICODE versions of the message
    if (pNMHDR->code == TTN_NEEDTEXTA)
    {
        TOOLTIPTEXTA* pTtta = reinterpret_cast<NMTTDISPINFOA*>(pNMHDR);
        pTtta->lpszText     = m_szTip;
        WideCharToMultiByte(CP_ACP, 0, strTipText, -1, m_szTip, strTipText.GetLength() + 1, nullptr, nullptr);
    }
    else
    {
        TOOLTIPTEXTW* pTttw = reinterpret_cast<NMTTDISPINFOW*>(pNMHDR);
        lstrcpyn(m_wszTip, strTipText, min(strTipText.GetLength() + 1, static_cast<int>(_countof(m_wszTip)) - 1));
        pTttw->lpszText = m_wszTip;
    }

    return TRUE; // message was handled
}

INT_PTR CBaseView::OnToolHitTest(CPoint point, TOOLINFO* pTi) const
{
    CRect rcClient;
    GetClientRect(rcClient);
    CRect textRect(rcClient.left, rcClient.top, rcClient.Width(), m_nLineHeight + HEADERHEIGHT);

    int marginWidth = GetSystemMetrics(SM_CXSMICON) + 2 + 2;
    if ((m_bViewLinenumbers) && (m_pViewData) && (m_pViewData->GetCount()) && (m_nDigits > 0))
    {
        marginWidth += (m_nDigits * m_nCharWidth) + 2;
    }
    CRect borderRect(rcClient.left, rcClient.top + m_nLineHeight + HEADERHEIGHT, marginWidth, rcClient.bottom);

    if (textRect.PtInRect(point) || borderRect.PtInRect(point))
    {
        // inside the header part of the view (showing the filename)
        pTi->hwnd = this->m_hWnd;
        this->GetClientRect(&pTi->rect);
        pTi->uFlags |= TTF_ALWAYSTIP | TTF_IDISHWND;
        pTi->uId      = reinterpret_cast<UINT_PTR>(m_hWnd);
        pTi->lpszText = LPSTR_TEXTCALLBACK;

        // we want multi line tooltips
        CToolTipCtrl* pToolTip = AfxGetModuleThreadState()->m_pToolTip;
        if (pToolTip->GetSafeHwnd())
            pToolTip->SetMaxTipWidth(SHRT_MAX);

        return (textRect.PtInRect(point) ? 1 : 2);
    }

    return -1;
}

void CBaseView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    bool bControl = !!(GetKeyState(VK_CONTROL) & 0x8000);
    bool bShift   = !!(GetKeyState(VK_SHIFT) & 0x8000);

    switch (nChar)
    {
        case VK_TAB:
            if (bControl)
            {
                if (this == m_pwndLeft)
                {
                    if (IsViewGood(m_pwndRight))
                    {
                        m_pwndRight->SetFocus();
                    }
                    else if (IsViewGood(m_pwndBottom))
                    {
                        m_pwndBottom->SetFocus();
                    }
                }
                else if (this == m_pwndRight)
                {
                    if (IsViewGood(m_pwndBottom))
                    {
                        m_pwndBottom->SetFocus();
                    }
                    else if (IsViewGood(m_pwndLeft))
                    {
                        m_pwndLeft->SetFocus();
                    }
                }
                else if (this == m_pwndBottom)
                {
                    if (IsViewGood(m_pwndLeft))
                    {
                        m_pwndLeft->SetFocus();
                    }
                    else if (IsViewGood(m_pwndRight))
                    {
                        m_pwndRight->SetFocus();
                    }
                }
            }
            break;
        case VK_PRIOR:
        {
            POINT ptCaretPos = GetCaretPosition();
            ptCaretPos.y -= GetScreenLines();
            ptCaretPos.y = max(ptCaretPos.y, 0l);
            ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nCaretGoalPos, false);
            SetCaretPosition(ptCaretPos);
            OnCaretMove(MOVELEFT, bShift);
            ShowDiffLines(ptCaretPos.y);
        }
        break;
        case VK_NEXT:
        {
            POINT ptCaretPos = GetCaretPosition();
            ptCaretPos.y += GetScreenLines();
            if (ptCaretPos.y >= GetLineCount())
                ptCaretPos.y = GetLineCount() - 1;
            ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nCaretGoalPos, false);
            SetCaretPosition(ptCaretPos);
            OnCaretMove(MOVERIGHT, bShift);
            ShowDiffLines(ptCaretPos.y);
        }
        break;
        case VK_HOME:
        {
            if (bControl)
            {
                ScrollAllToLine(0);
                ScrollAllToChar(0);
                SetCaretToViewStart();
                m_nCaretGoalPos = 0;
                if (bShift)
                    AdjustSelection(MOVELEFT);
                else
                    ClearSelection();
                UpdateCaret();
            }
            else
            {
                POINT   ptCaretPos = GetCaretPosition();
                CString sLine      = GetLineChars(ptCaretPos.y);
                int     pos        = 0;
                while (pos < sLine.GetLength())
                {
                    if (sLine[pos] != ' ' && sLine[pos] != '\t')
                        break;
                    ++pos;
                }
                if (ptCaretPos.x == pos)
                {
                    SetCaretToLineStart();
                    m_nCaretGoalPos = 0;
                    OnCaretMove(MOVERIGHT, bShift);
                    ScrollAllToChar(0);
                }
                else
                {
                    ptCaretPos.x = pos;
                    SetCaretAndGoalPosition(ptCaretPos);
                    OnCaretMove(MOVELEFT, bShift);
                }
            }
        }
        break;
        case VK_END:
        {
            if (bControl)
            {
                ScrollAllToLine(GetLineCount() - GetAllMinScreenLines());
                POINT ptCaretPos;
                ptCaretPos.y = GetLineCount() - 1;
                ptCaretPos.x = GetLineLength(ptCaretPos.y);
                SetCaretAndGoalPosition(ptCaretPos);
                if (bShift)
                    AdjustSelection(MOVERIGHT);
                else
                    ClearSelection();
            }
            else
            {
                POINT ptCaretPos = GetCaretPosition();
                ptCaretPos.x     = GetLineLength(ptCaretPos.y);
                if ((GetSubLineOffset(ptCaretPos.y) != -1) && (GetSubLineOffset(ptCaretPos.y) != CountMultiLines(GetViewLineForScreen(ptCaretPos.y)) - 1)) // not last screen line of view line
                {
                    ptCaretPos.x--;
                }
                SetCaretAndGoalPosition(ptCaretPos);
                OnCaretMove(MOVERIGHT, bShift);
            }
        }
        break;
        case VK_BACK:
            if (IsWritable())
            {
                if (!HasTextSelection())
                {
                    POINT ptCaretPos = GetCaretPosition();
                    if (ptCaretPos.y == 0 && ptCaretPos.x == 0)
                        break;
                    m_ptSelectionViewPosEnd = GetCaretViewPosition();
                    if (bControl)
                        MoveCaretWordLeft();
                    else
                    {
                        while (MoveCaretLeft() && IsViewLineEmpty(GetCaretViewPosition().y))
                        {
                        }
                    }
                    m_ptSelectionViewPosStart = GetCaretViewPosition();
                }
                RemoveSelectedText();
            }
            break;
        case VK_DELETE:
            if (IsWritable())
            {
                if (!HasTextSelection())
                {
                    if (bControl)
                    {
                        m_ptSelectionViewPosStart = GetCaretViewPosition();
                        MoveCaretWordRight();
                        m_ptSelectionViewPosEnd = GetCaretViewPosition();
                    }
                    else
                    {
                        if (!MoveCaretRight())
                            break;
                        m_ptSelectionViewPosEnd = GetCaretViewPosition();
                        MoveCaretLeft();
                        m_ptSelectionViewPosStart = GetCaretViewPosition();
                    }
                }
                RemoveSelectedText();
            }
            break;
        case VK_INSERT:
            m_bInsertMode = !m_bInsertMode;
            UpdateCaret();
            break;
        case 'M':
            if (bControl && m_pwndRight)
            {
                int nFirstViewLine = 0;
                int nLastViewLine  = 0;
                if (GetViewSelection(nFirstViewLine, nLastViewLine))
                {
                    m_pwndRight->MarkBlock(!m_pwndRight->GetViewMarked(nFirstViewLine));
                }
            }
            break;
    }
    CView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CBaseView::OnLButtonDown(UINT nFlags, CPoint point)
{
    const int nClickedLine = GetButtonEventLineIndex(point);
    m_nLDownLine           = nClickedLine;
    if ((nClickedLine >= m_nTopLine) && (nClickedLine < GetLineCount()))
    {
        POINT ptCaretPos;
        ptCaretPos.y = nClickedLine;
        int xPos2    = CalcColFromPoint(point.x, nClickedLine);
        ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, xPos2, false);
        SetCaretAndGoalPosition(ptCaretPos);

        if (nFlags & MK_SHIFT)
            AdjustSelection(MOVERIGHT);
        else
        {
            ClearSelection();
            SetupAllSelection(ptCaretPos.y, ptCaretPos.y);
            if (point.x < GetMarginWidth())
            {
                // select the whole line
                m_ptSelectionViewPosStart = m_ptSelectionViewPosEnd = GetCaretViewPosition();
                m_ptSelectionViewPosStart.x                         = 0;
                m_ptSelectionViewPosEnd.x                           = GetViewLineLength(m_ptSelectionViewPosEnd.y);
            }
        }

        UpdateViewsCaretPosition();
        Invalidate();
    }

    CView::OnLButtonDown(nFlags, point);
}

CBaseView::ECharGroup CBaseView::GetCharGroup(wchar_t zChar) const
{
    if (zChar == ' ' || zChar == '\t')
    {
        return CHG_WHITESPACE;
    }
    if (zChar < 0x20)
    {
        return CHG_CONTROL;
    }
    if (m_sWordSeparators.Find(zChar) >= 0)
    {
        return CHG_WORDSEPARATOR;
    }
    return CHG_WORDLETTER;
}

void CBaseView::OnLButtonDblClk(UINT nFlags, CPoint point)
{
    if (m_pViewData == nullptr)
    {
        CView::OnLButtonDblClk(nFlags, point);
        return;
    }

    const int nClickedLine = GetButtonEventLineIndex(point);
    if (nClickedLine < 0)
        return;
    int nViewLine = GetViewLineForScreen(nClickedLine);
    if (point.x < GetMarginWidth()) // only if double clicked on the margin
    {
        if ((nViewLine < m_pViewData->GetCount())) // a double click on moved line scrolls to corresponding line
        {
            if (m_pViewData->GetMovedIndex(nViewLine) >= 0)
            {
                int movedIndex = m_pViewData->GetMovedIndex(nViewLine);
                int screenLine = FindViewLineNumber(movedIndex);
                int nTop       = screenLine - GetScreenLines() / 2;
                if (nTop < 0)
                    nTop = 0;
                ScrollAllToLine(nTop);
                // find and select the whole moved block
                int startSel = movedIndex;
                int endSel   = movedIndex;
                while ((startSel > 0) && (m_pOtherViewData->GetMovedIndex(startSel) >= 0))
                    startSel--;
                startSel++;
                while ((endSel < GetLineCount()) && (m_pOtherViewData->GetMovedIndex(endSel) >= 0))
                    endSel++;
                endSel--;
                m_pOtherView->SetupSelection(startSel, endSel);
                return CView::OnLButtonDblClk(nFlags, point);
            }
        }
    }
    if ((m_pMainFrame->m_bCollapsed) && (m_pViewData->GetHideState(nViewLine) == HIDESTATE_MARKER))
    {
        // a double click on a marker expands the hidden text
        int i = nViewLine;
        while ((i < m_pViewData->GetCount()) && (m_pViewData->GetHideState(i) != HIDESTATE_SHOWN))
        {
            if ((m_pwndLeft) && (m_pwndLeft->m_pViewData))
                m_pwndLeft->m_pViewData->SetLineHideState(i, HIDESTATE_SHOWN);
            if ((m_pwndRight) && (m_pwndRight->m_pViewData))
                m_pwndRight->m_pViewData->SetLineHideState(i, HIDESTATE_SHOWN);
            if ((m_pwndBottom) && (m_pwndBottom->m_pViewData))
                m_pwndBottom->m_pViewData->SetLineHideState(i, HIDESTATE_SHOWN);
            i++;
        }
        BuildAllScreen2ViewVector();
        if (m_pwndLeft)
            m_pwndLeft->Invalidate();
        if (m_pwndRight)
            m_pwndRight->Invalidate();
        if (m_pwndBottom)
            m_pwndBottom->Invalidate();
    }
    else
    {
        POINT ptCaretPos;
        ptCaretPos.y = nClickedLine;
        ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nOffsetChar + (point.x - GetMarginWidth()) / GetCharWidth(), false);
        SetCaretPosition(ptCaretPos);
        ClearSelection();

        POINT ptViewCaret = GetCaretViewPosition();
        nViewLine         = ptViewCaret.y;
        if (nViewLine >= GetViewCount())
            return;
        const CString& sLine       = GetViewLine(nViewLine);
        int            nLineLength = sLine.GetLength();
        int            nBasePos    = ptViewCaret.x;
        // get target char group
        ECharGroup eLeft = CHG_UNKNOWN;
        if (nBasePos > 0)
        {
            eLeft = GetCharGroup(sLine[nBasePos - 1]);
        }
        ECharGroup eRight = CHG_UNKNOWN;
        if (nBasePos < nLineLength)
        {
            eRight = GetCharGroup(sLine[nBasePos]);
        }
        ECharGroup eTarget = max(eRight, eLeft);
        // find left margin
        int nLeft = nBasePos;
        while (nLeft > 0 && GetCharGroup(sLine[nLeft - 1]) == eTarget)
        {
            nLeft--;
        }
        // get right margin
        int nRight = nBasePos;
        while (nRight < nLineLength && GetCharGroup(sLine[nRight]) == eTarget)
        {
            nRight++;
        }
        // set selection
        m_ptSelectionViewPosStart.x = nLeft;
        m_ptSelectionViewPosStart.y = nViewLine;
        m_ptSelectionViewPosEnd.x   = nRight;
        m_ptSelectionViewPosEnd.y   = nViewLine;
        m_ptSelectionViewPosOrigin  = m_ptSelectionViewPosStart;
        SetupAllViewSelection(nViewLine, nViewLine);
        // set caret
        ptCaretPos = ConvertViewPosToScreen(m_ptSelectionViewPosEnd);
        UpdateViewsCaretPosition();
        UpdateGoalPos();

        // set mark word
        m_sPreviousMarkedWord = m_sMarkedWord; // store marked word to recall in case of triple click
        int nMarkWidth        = max(nRight - nLeft, 0);
        m_sMarkedWord         = sLine.Mid(m_ptSelectionViewPosStart.x, nMarkWidth).Trim();
        if (m_sMarkedWord.Compare(m_sPreviousMarkedWord) == 0)
        {
            m_sMarkedWord.Empty();
        }

        if (GetKeyState(VK_CONTROL) & 0x8000)
        {
            // if the ctrl key is pressed, only
            // mark the words in this view
            SetMarkedWord(m_sMarkedWord);
        }
        else
        {
            if (m_pwndLeft)
                m_pwndLeft->SetMarkedWord(m_sMarkedWord);
            if (m_pwndRight)
                m_pwndRight->SetMarkedWord(m_sMarkedWord);
            if (m_pwndBottom)
                m_pwndBottom->SetMarkedWord(m_sMarkedWord);
        }

        Invalidate();
        if (m_pwndLocator)
            m_pwndLocator->Invalidate();
    }

    CView::OnLButtonDblClk(nFlags, point);
}

void CBaseView::OnLButtonTrippleClick(UINT /*nFlags*/, CPoint point)
{
    const int nClickedLine = GetButtonEventLineIndex(point);
    if (((point.y - (GetLineHeight() + HEADERHEIGHT)) / GetLineHeight()) <= 0)
    {
        if (!m_sConvertedFilePath.IsEmpty() && (GetKeyState(VK_CONTROL) & 0x8000))
        {
            PCIDLIST_ABSOLUTE __unaligned pidl = ILCreateFromPath(static_cast<LPCWSTR>(m_sConvertedFilePath));
            if (pidl)
            {
                SHOpenFolderAndSelectItems(pidl, 0, nullptr, 0);
                CoTaskMemFree(static_cast<LPVOID>(const_cast<PIDLIST_ABSOLUTE>(pidl)));
            }
        }
        return;
    }
    POINT ptCaretPos;
    ptCaretPos.y = nClickedLine;
    ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nOffsetChar + (point.x - GetMarginWidth()) / GetCharWidth(), false);
    SetCaretAndGoalPosition(ptCaretPos);
    m_sMarkedWord = m_sPreviousMarkedWord; // recall previous Marked word
    if (m_pwndLeft)
        m_pwndLeft->SetMarkedWord(m_sMarkedWord);
    if (m_pwndRight)
        m_pwndRight->SetMarkedWord(m_sMarkedWord);
    if (m_pwndBottom)
        m_pwndBottom->SetMarkedWord(m_sMarkedWord);
    ClearSelection();
    m_ptSelectionViewPosStart.x = 0;
    m_ptSelectionViewPosStart.y = nClickedLine;
    m_ptSelectionViewPosEnd.x   = GetLineLength(nClickedLine);
    m_ptSelectionViewPosEnd.y   = nClickedLine;
    SetupSelection(m_ptSelectionViewPosStart.y, m_ptSelectionViewPosEnd.y);
    UpdateViewsCaretPosition();
    Invalidate();
    if (m_pwndLocator)
        m_pwndLocator->Invalidate();
}

// ReSharper disable once CppMemberFunctionMayBeConst
void CBaseView::OnEditCopy()
{
    CString sCopyData = GetSelectedText();

    if (!sCopyData.IsEmpty())
    {
        CStringUtils::WriteAsciiStringToClipboard(sCopyData, m_hWnd);
    }
}

void CBaseView::OnMouseMove(UINT nFlags, CPoint point)
{
    if (m_pMainFrame->m_nMoveMovesToIgnore > 0)
    {
        --m_pMainFrame->m_nMoveMovesToIgnore;
        CView::OnMouseMove(nFlags, point);
        return;
    }
    int nMouseLine = GetButtonEventLineIndex(point);
    if (nMouseLine < -1)
        nMouseLine = -1;
    m_mouseInMargin = point.x < GetMarginWidth();

    ShowDiffLines(nMouseLine);

    KillTimer(IDT_SCROLLTIMER);
    if (nFlags & MK_LBUTTON)
    {
        int saveMouseLine = nMouseLine >= 0 ? nMouseLine : 0;
        saveMouseLine     = saveMouseLine < GetLineCount() ? saveMouseLine : GetLineCount() - 1;
        if (saveMouseLine < 0)
            return;
        int col       = CalcColFromPoint(point.x, saveMouseLine);
        int charIndex = CalculateCharIndex(saveMouseLine, col, true);
        if (HasSelection() &&
            ((nMouseLine >= m_nTopLine) && (nMouseLine < GetLineCount())))
        {
            POINT ptCaretPos = {charIndex, nMouseLine};
            SetCaretAndGoalPosition(ptCaretPos);
            AdjustSelection(MOVERIGHT);
            Invalidate();
            UpdateWindow();
        }
        if (m_nLDownLine < 0)
            return; // no scrolling if the click started on the header
        if (nMouseLine < m_nTopLine)
        {
            ScrollAllToLine(m_nTopLine - 1, TRUE);
            SetTimer(IDT_SCROLLTIMER, 20, nullptr);
        }
        if (nMouseLine >= m_nTopLine + GetScreenLines() - 2)
        {
            ScrollAllToLine(m_nTopLine + 1, TRUE);
            SetTimer(IDT_SCROLLTIMER, 20, nullptr);
        }
        if (!m_pMainFrame->m_bWrapLines && ((m_nOffsetChar + (point.x - GetMarginWidth()) / GetCharWidth()) <= m_nOffsetChar))
        {
            ScrollAllSide(-1);
            SetTimer(IDT_SCROLLTIMER, 20, nullptr);
        }
        if (!m_pMainFrame->m_bWrapLines && (charIndex >= (GetScreenChars() + m_nOffsetChar - 4)))
        {
            ScrollAllSide(1);
            SetTimer(IDT_SCROLLTIMER, 20, nullptr);
        }
        SetCapture();
    }

    CView::OnMouseMove(nFlags, point);
}

void CBaseView::OnLButtonUp(UINT nFlags, CPoint point)
{
    ShowDiffLines(-1);
    ReleaseCapture();
    KillTimer(IDT_SCROLLTIMER);

    __super::OnLButtonUp(nFlags, point);
}

void CBaseView::OnTimer(UINT_PTR nIDEvent)
{
    if (nIDEvent == IDT_SCROLLTIMER)
    {
        POINT point;
        GetCursorPos(&point);
        ScreenToClient(&point);
        int nMouseLine = GetButtonEventLineIndex(point);
        if (nMouseLine < -1)
        {
            nMouseLine = -1;
        }
        if (GetKeyState(VK_LBUTTON) & 0x8000)
        {
            int saveMouseLine = nMouseLine >= 0 ? nMouseLine : 0;
            saveMouseLine     = saveMouseLine < GetLineCount() ? saveMouseLine : GetLineCount() - 1;
            int charIndex     = CalculateCharIndex(saveMouseLine, m_nOffsetChar + (point.x - GetMarginWidth()) / GetCharWidth(), false);
            if (nMouseLine < m_nTopLine)
            {
                ScrollAllToLine(m_nTopLine - 1, TRUE);
                SetTimer(IDT_SCROLLTIMER, 20, nullptr);
            }
            if (nMouseLine >= m_nTopLine + GetScreenLines() - 2)
            {
                ScrollAllToLine(m_nTopLine + 1, TRUE);
                SetTimer(IDT_SCROLLTIMER, 20, nullptr);
            }
            if (!m_pMainFrame->m_bWrapLines && ((m_nOffsetChar + (point.x - GetMarginWidth()) / GetCharWidth()) <= m_nOffsetChar))
            {
                ScrollAllSide(-1);
                SetTimer(IDT_SCROLLTIMER, 20, nullptr);
            }
            if (!m_pMainFrame->m_bWrapLines && (charIndex >= (GetScreenChars() + m_nOffsetChar - 4)))
            {
                ScrollAllSide(1);
                SetTimer(IDT_SCROLLTIMER, 20, nullptr);
            }
        }
    }

    CView::OnTimer(nIDEvent);
}

void CBaseView::ShowDiffLines(int nLine)
{
    if ((nLine < m_nTopLine) || (nLine >= GetLineCount()))
    {
        m_pwndLineDiffBar->ShowLines(nLine);
        nLine        = -1;
        m_nMouseLine = nLine;
        return;
    }

    if ((!m_pwndRight) || (!m_pwndLeft))
        return;
    if (m_pMainFrame->m_bOneWay)
        return;

    nLine = (nLine > static_cast<int>(m_pwndRight->m_screen2View.size()) ? -1 : nLine);
    nLine = (nLine > static_cast<int>(m_pwndLeft->m_screen2View.size()) ? -1 : nLine);

    if (nLine < 0)
        return;

    if (nLine != m_nMouseLine)
    {
        if (nLine >= GetLineCount())
            nLine = -1;
        m_nMouseLine = nLine;
        m_pwndLineDiffBar->ShowLines(nLine);
    }
    m_pMainFrame->m_nMoveMovesToIgnore = MOVESTOIGNORE;
}

const ViewData& CBaseView::GetEmptyLineData()
{
    static const ViewData emptyLine(L"", DIFFSTATE_EMPTY, -1, EOL_NOENDING, HIDESTATE_SHOWN);
    return emptyLine;
}

void CBaseView::InsertViewEmptyLines(int nFirstView, int nCount) const
{
    for (int i = 0; i < nCount; i++)
    {
        InsertViewData(nFirstView, GetEmptyLineData());
    }
}

void CBaseView::UpdateCaret()
{
    POINT ptCaretPos = GetCaretPosition();
    ptCaretPos.y     = std::max<int>(std::min<int>(ptCaretPos.y, GetLineCount() - 1), 0);
    ptCaretPos.x     = std::max<int>(std::min<int>(ptCaretPos.x, GetLineLength(ptCaretPos.y)), 0);
    SetCaretPosition(ptCaretPos);

    int nCaretOffset = CalculateActualOffset(ptCaretPos);

    if (m_bFocused &&
        ptCaretPos.y >= m_nTopLine &&
        ptCaretPos.y < (m_nTopLine + GetScreenLines()) &&
        nCaretOffset >= m_nOffsetChar &&
        nCaretOffset < (m_nOffsetChar + GetScreenChars()))
    {
        POINT pt1 = TextToClient(ptCaretPos);
        if (m_bInsertMode)
            CreateSolidCaret(2, GetLineHeight());
        else
        {
            POINT pt    = {ptCaretPos.x + 1, ptCaretPos.y};
            POINT pt2   = TextToClient(pt);
            int   width = max(GetCharWidth(), static_cast<int>(pt2.x - pt1.x));
            CreateSolidCaret(width, GetLineHeight());
        }
        SetCaretPos(pt1);
        ShowCaret();
    }
    else
    {
        HideCaret();
    }
}

POINT CBaseView::ConvertScreenPosToView(const POINT& pt)
{
    POINT ptViewPos;
    ptViewPos.x = pt.x;

    int nSubLine = GetSubLineOffset(pt.y);
    if (nSubLine > 0)
    {
        for (int nScreenLine = pt.y - 1; nScreenLine >= pt.y - nSubLine; nScreenLine--)
        {
            ptViewPos.x += GetLineChars(nScreenLine).GetLength();
        }
    }

    ptViewPos.y = GetViewLineForScreen(pt.y);
    return ptViewPos;
}

POINT CBaseView::ConvertViewPosToScreen(const POINT& pt)
{
    POINT ptPos;
    int   nViewLineLenLeft = GetViewLineLength(pt.y);
    ptPos.x                = min(static_cast<LONG>(nViewLineLenLeft), pt.x);
    ptPos.y                = FindScreenLineForViewLine(pt.y);
    if (GetViewLineForScreen(ptPos.y) != pt.y)
    {
        ptPos.x = 0;
    }
    else if (GetSubLineOffset(ptPos.y) >= 0) // sublined
    {
        int nSubLineLength = GetLineChars(ptPos.y).GetLength();
        while (nSubLineLength < ptPos.x)
        {
            ptPos.x -= nSubLineLength;
            nViewLineLenLeft -= nSubLineLength;
            ptPos.y++;
            nSubLineLength = GetLineChars(ptPos.y).GetLength();

            // particular case when only first line exist. Without below statement we
            // have infinite loop because nSublineLengh = 0 and ptPos.x = 1, 0 < 1
            if (nSubLineLength == 0)
            {
                ptPos.y = 0;
                ptPos.x = 0;
            }
        }
        // last pos of non last sub-line go to start of next screen line
        // Note: while this works correctly, it's not what a user might expect:
        // cursor-right when the caret is before the last char of a wrapped line
        // now moves the caret to the next line. But users expect the caret to
        // move to the right of the last char instead, and with another cursor-right
        // keystroke to move the caret to the next line.
        // Basically, this would require to handle two caret positions for the same
        // logical position in the line string (one on the last position of the first line,
        // one on the first position of the new line. For non-wrapped lines this works
        // because there's an 'invisible' newline char at the end of the first line.
        if (nSubLineLength == ptPos.x && nViewLineLenLeft > nSubLineLength)
        {
            ptPos.x = 0;
            ptPos.y++;
        }
    }

    return ptPos;
}

void CBaseView::EnsureCaretVisible()
{
    POINT ptCaretPos   = GetCaretPosition();
    int   nCaretOffset = CalculateActualOffset(ptCaretPos);

    if (ptCaretPos.y < m_nTopLine)
        ScrollAllToLine(ptCaretPos.y);
    int screnLines = GetScreenLines();
    if (screnLines)
    {
        if (ptCaretPos.y >= (m_nTopLine + screnLines) - 1)
            ScrollAllToLine(ptCaretPos.y - screnLines + 2);
        if (nCaretOffset < m_nOffsetChar)
            ScrollAllToChar(nCaretOffset);
        if (nCaretOffset > (m_nOffsetChar + GetScreenChars() - 1))
            ScrollAllToChar(nCaretOffset - GetScreenChars() + 1);
    }
}

int CBaseView::CalculateActualOffset(const POINT& point)
{
    int nLineIndex = point.y;
    int nCharIndex = point.x;
    ASSERT(nCharIndex >= 0);
    CString sLine       = GetLineChars(nLineIndex);
    int     nLineLength = sLine.GetLength();
    return CountExpandedChars(sLine, min(nCharIndex, nLineLength));
}

int CBaseView::CalculateCharIndex(int nLineIndex, int nActualOffset, bool allowEOL)
{
    int nLength  = GetLineLength(nLineIndex);
    int nSubLine = GetSubLineOffset(nLineIndex);
    if (!allowEOL && nSubLine >= 0)
    {
        int nViewLine = GetViewLineForScreen(nLineIndex);
        if ((nViewLine >= 0) && (nViewLine < static_cast<int>(m_screenedViewLine.size())))
        {
            int nMultilineCount = CountMultiLines(nViewLine);
            if ((nMultilineCount > 0) && (nSubLine < nMultilineCount - 1))
            {
                nLength--;
            }
        }
    }
    CString line     = GetLineChars(nLineIndex);
    int     nIndex   = 0;
    int     nOffset  = 0;
    int     nTabSize = GetTabSize();
    while (nOffset < nActualOffset && nIndex < nLength)
    {
        if (line.GetAt(nIndex) == '\t')
            nOffset += (nTabSize - nOffset % nTabSize);
        else
            ++nOffset;
        ++nIndex;
    }
    return nIndex;
}

/**
 * @param xpos X coordinate in CBaseView
 * @param lineIndex logical line index (e.g. wrap/collapse)
 */
int CBaseView::CalcColFromPoint(int xpos, int lineIndex)
{
    int  xPos2 = 0;
    CDC* pDC   = GetDC();
    if (pDC)
    {
        CString text      = ExpandChars(GetLineChars(lineIndex), 0);
        int     fit       = text.GetLength();
        auto    posBuffer = std::make_unique<int[]>(fit);
        pDC->SelectObject(GetFont()); // is this right font ?
        SIZE size;
        GetTextExtentExPoint(pDC->GetSafeHdc(), text, fit, INT_MAX, &fit, posBuffer.get(), &size);
        ReleaseDC(pDC);
        int lower = -1, upper = fit - 1;
        int xCheck = xpos - GetMarginWidth() + m_nOffsetChar * GetCharWidth();
        do
        {
            int middle = (upper + lower + 1) / 2;
            int width  = posBuffer.get()[middle];
            if (xCheck < width)
                upper = middle - 1;
            else
                lower = middle;
        } while (lower < upper);
        lower++;
        xPos2 = lower;
        if (lower < fit - 1)
        {
            int charWidth = posBuffer.get()[lower] - (lower > 0 ? posBuffer.get()[lower - 1] : 0);
            if (posBuffer.get()[lower] - xCheck <= charWidth / 2)
                xPos2++;
        }
    }
    else
    {
        xPos2 = (xpos - GetMarginWidth()) / GetCharWidth() + m_nOffsetChar;
        if ((xpos % GetCharWidth()) >= (GetCharWidth() / 2))
            xPos2++;
    }
    return xPos2;
}

POINT CBaseView::TextToClient(const POINT& point)
{
    POINT pt;
    int   nOffsetScreenLine = max(0, static_cast<int>(point.y - m_nTopLine));
    pt.y                    = nOffsetScreenLine * GetLineHeight();
    pt.x                    = CalculateActualOffset(point);

    int  nLeft = GetMarginWidth() - m_nOffsetChar * GetCharWidth();
    CDC* pDC   = GetDC();
    if (pDC)
    {
        pDC->SelectObject(GetFont()); // is this right font ?
        int     nScreenLine = nOffsetScreenLine + m_nTopLine;
        CString sLine       = GetLineChars(nScreenLine);
        ExpandChars(sLine, 0, std::min<int>(pt.x, sLine.GetLength()), sLine);
        nLeft += pDC->GetTextExtent(sLine, pt.x).cx;
        ReleaseDC(pDC);
    }
    else
    {
        nLeft += pt.x * GetCharWidth();
    }

    pt.x = nLeft;
    pt.y = (pt.y + GetLineHeight() + HEADERHEIGHT);
    return pt;
}

void CBaseView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    CView::OnChar(nChar, nRepCnt, nFlags);

    bool bShift              = !!(GetKeyState(VK_SHIFT) & 0x8000);
    bool bControl            = !!(GetKeyState(VK_CONTROL) & 0x8000);
    bool bSkipSelectionClear = false;

    if (IsReadonly())
        return;

    if ((::GetKeyState(VK_LBUTTON) & 0x8000) != 0 ||
        (::GetKeyState(VK_RBUTTON) & 0x8000) != 0)
    {
        return;
    }

    if (!m_pViewData) // no data - nothing to do
        return;

    if (nChar == VK_F16)
    {
        // generated by a ctrl+backspace - ignore.
    }
    else if (nChar == VK_TAB && HasTextLineSelection())
    {
        // change indentation for selected lines
        if (bShift)
        {
            RemoveIndentationForSelectedBlock();
        }
        else
        {
            AddIndentationForSelectedBlock();
        }
        bSkipSelectionClear = true;
    }
    else if ((nChar > 31) || (nChar == VK_TAB))
    {
        ResetUndoStep();
        RemoveSelectedText();
        POINT ptCaretViewPos = GetCaretViewPosition();
        int   nViewLine      = ptCaretViewPos.y;
        if ((nViewLine == 0) && (GetViewCount() == 0))
            OnChar(VK_RETURN, 0, 0);
        int      charCount = 1;
        ViewData lineData  = GetViewData(nViewLine);
        if (nChar == VK_TAB)
        {
            int indentChars = GetIndentCharsForLine(ptCaretViewPos.x, nViewLine);
            if (indentChars > 0)
            {
                lineData.sLine.Insert(ptCaretViewPos.x, CString(' ', indentChars));
                charCount = indentChars;
            }
            else
                lineData.sLine.Insert(ptCaretViewPos.x, '\t');
        }
        else
        {
            if (m_bInsertMode)
                lineData.sLine.Insert(ptCaretViewPos.x, static_cast<wchar_t>(nChar));
            else
            {
                if (lineData.sLine.GetLength() > ptCaretViewPos.x)
                    lineData.sLine.SetAt(ptCaretViewPos.x, static_cast<wchar_t>(nChar));
                else
                    lineData.sLine.Insert(ptCaretViewPos.x, static_cast<wchar_t>(nChar));
            }
        }
        if (IsStateEmpty(lineData.state) || IsStateConflicted(lineData.state) || lineData.state == DIFFSTATE_IDENTICALREMOVED)
        {
            // if not last line set EOL
            for (int nCheckViewLine = nViewLine + 1; nCheckViewLine < GetViewCount(); nCheckViewLine++)
            {
                if (!IsViewLineEmpty(nCheckViewLine))
                {
                    lineData.ending = m_lineEndings;
                    break;
                }
            }
            // make sure previous (non empty) line have EOL set
            for (int nCheckViewLine = nViewLine - 1; nCheckViewLine > 0; nCheckViewLine--)
            {
                if (!IsViewLineEmpty(nCheckViewLine) && GetViewState(nCheckViewLine) != DIFFSTATE_IDENTICALREMOVED)
                {
                    if (GetViewLineEnding(nCheckViewLine) == EOL_NOENDING)
                    {
                        SetViewLineEnding(nCheckViewLine, m_lineEndings);
                    }
                    break;
                }
            }
        }
        lineData.state     = DIFFSTATE_EDITED;
        bool bNeedRenumber = false;
        if (lineData.lineNumber == -1)
        {
            lineData.lineNumber = 0;
            bNeedRenumber       = true;
        }
        SetViewData(nViewLine, lineData);
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector(nViewLine);
        if (bNeedRenumber)
        {
            UpdateViewLineNumbers();
        }
        for (int i = 0; i < charCount; ++i)
            MoveCaretRight();
        UpdateGoalPos();
    }
    else if (nChar == 10)
    {
        int nViewLine = GetViewLineForScreen(GetCaretPosition().y);
        EOL eol       = m_pViewData->GetLineEnding(nViewLine);
        EOL newEOL    = EOL_CRLF;
        switch (eol)
        {
            case EOL_CRLF:
                newEOL = EOL_CR;
                break;
            case EOL_CR:
                newEOL = EOL_LF;
                break;
            case EOL_LF:
                newEOL = EOL_CRLF;
                break;
            default:
                break;
        }
        if (eol == EOL_NOENDING || eol == newEOL)
            // don't allow to change enter on empty line, or last text line (lines with EOL_NOENDING)
            // to add EOL on newly edited empty line hit enter
            // don't store into UNDO if no change happened
            // and don't mark file as modified
            return;
        AddUndoViewLine(nViewLine);
        m_pViewData->SetLineEnding(nViewLine, newEOL);
        m_pViewData->SetState(nViewLine, DIFFSTATE_EDITED);
        UpdateGoalPos();
    }
    else if ((nChar == VK_RETURN) && !bControl)
    {
        // insert a new, fresh and empty line below the cursor
        RemoveSelectedText();

        CUndo::GetInstance().BeginGrouping();

        POINT   ptCaretViewPos  = GetCaretViewPosition();
        int     nViewLine       = ptCaretViewPos.y;
        int     nLeft           = ptCaretViewPos.x;
        CString sLine           = GetViewLineChars(nViewLine);
        CString sLineLeft       = sLine.Left(nLeft);
        CString sLineRight      = sLine.Right(sLine.GetLength() - nLeft);
        EOL     eOriginalEnding = EOL_AUTOLINE;
        if (m_pViewData->GetCount() > nViewLine)
            eOriginalEnding = GetViewLineEnding(nViewLine);

        if (!sLineRight.IsEmpty() || (eOriginalEnding != m_lineEndings))
        {
            ViewData newFirstLine(sLineLeft, DIFFSTATE_EDITED, 1, m_lineEndings, HIDESTATE_SHOWN);
            SetViewData(nViewLine, newFirstLine);
        }

        int      nInsertLine = (m_pViewData->GetCount() == 0) ? 0 : nViewLine + 1;
        ViewData newLastLine(sLineRight, DIFFSTATE_EDITED, 1, eOriginalEnding, HIDESTATE_SHOWN);
        InsertViewData(nInsertLine, newLastLine);
        SetModified();
        SaveUndoStep();

        // adds new line everywhere except me
        if (IsViewGood(m_pwndLeft) && m_pwndLeft != this)
        {
            m_pwndLeft->InsertViewEmptyLines(nInsertLine, 1);
        }
        if (IsViewGood(m_pwndRight) && m_pwndRight != this)
        {
            m_pwndRight->InsertViewEmptyLines(nInsertLine, 1);
        }
        if (IsViewGood(m_pwndBottom) && m_pwndBottom != this)
        {
            m_pwndBottom->InsertViewEmptyLines(nInsertLine, 1);
        }
        SaveUndoStep();

        UpdateViewLineNumbers();
        SaveUndoStep();
        CUndo::GetInstance().EndGrouping();

        BuildAllScreen2ViewVector();
        // move the cursor to the new line
        ptCaretViewPos = SetupPoint(0, nViewLine + 1);
        SetCaretAndGoalViewPosition(ptCaretViewPos);
    }
    else
        return; // Unknown control character -- ignore it.
    if (!bSkipSelectionClear)
        ClearSelection();
    EnsureCaretVisible();
    UpdateCaret();
    Invalidate(FALSE);
}

void CBaseView::AddUndoViewLine(int nViewLine, bool bAddEmptyLine)
{
    ResetUndoStep();
    m_allState.left.AddViewLineFromView(m_pwndLeft, nViewLine, bAddEmptyLine);
    m_allState.right.AddViewLineFromView(m_pwndRight, nViewLine, bAddEmptyLine);
    m_allState.bottom.AddViewLineFromView(m_pwndBottom, nViewLine, bAddEmptyLine);
    SetModified();
    SaveUndoStep();
    RecalcAllVertScrollBars();
    Invalidate(FALSE);
}

void CBaseView::AddEmptyViewLine(int nViewLineIndex)
{
    if (!m_pViewData)
        return;
    int viewLine = nViewLineIndex;
    EOL ending   = m_pViewData->GetLineEnding(viewLine);
    if (ending == EOL_NOENDING)
    {
        ending = m_lineEndings;
    }
    ViewData newLine(L"", DIFFSTATE_EDITED, -1, ending, HIDESTATE_SHOWN);
    if (IsTarget()) // TODO: once more wievs will writable this is not correct anymore
    {
        CString sPartLine = GetViewLineChars(nViewLineIndex);
        int     nPosx     = GetCaretPosition().x; // should be view pos ?
        m_pViewData->SetLine(viewLine, sPartLine.Left(nPosx));
        sPartLine     = sPartLine.Mid(nPosx);
        newLine.sLine = sPartLine;
    }
    m_pViewData->InsertData(viewLine + 1, newLine);
    BuildAllScreen2ViewVector();
}

void CBaseView::RemoveSelectedText()
{
    if (!m_pViewData)
        return;
    if (!HasTextSelection())
        return;

    // fix selection if starts or ends on empty line
    SetCaretViewPosition(m_ptSelectionViewPosEnd);
    while (IsViewLineEmpty(GetCaretViewPosition().y) && MoveCaretRight())
    {
    }
    m_ptSelectionViewPosEnd = GetCaretViewPosition();
    SetCaretViewPosition(m_ptSelectionViewPosStart);
    while (IsViewLineEmpty(GetCaretViewPosition().y) && MoveCaretRight())
    {
    }
    m_ptSelectionViewPosStart = GetCaretViewPosition();
    if (!HasTextSelection())
    {
        ClearSelection();
        return;
    }

    // We want to undo the insertion in a single step.
    ResetUndoStep();
    CUndo::GetInstance().BeginGrouping();

    // combine first and last line
    ViewData oFirstLine = GetViewData(m_ptSelectionViewPosStart.y);
    ViewData oLastLine  = GetViewData(m_ptSelectionViewPosEnd.y);
    oFirstLine.sLine    = oFirstLine.sLine.Left(m_ptSelectionViewPosStart.x) + oLastLine.sLine.Mid(m_ptSelectionViewPosEnd.x);
    oFirstLine.ending   = (oLastLine.ending != EOL::EOL_NOENDING || m_ptSelectionViewPosEnd.y == (GetLineCount() - 1))
                              ? oLastLine.ending
                              : oFirstLine.ending;
    oFirstLine.state    = DIFFSTATE_EDITED;
    SetViewData(m_ptSelectionViewPosStart.y, oFirstLine);

    // clean up middle lines if any
    if (m_ptSelectionViewPosStart.y != m_ptSelectionViewPosEnd.y)
    {
        ViewData oEmptyLine = GetEmptyLineData();
        for (int nViewLine = m_ptSelectionViewPosStart.y + 1; nViewLine <= m_ptSelectionViewPosEnd.y; nViewLine++)
        {
            SetViewData(nViewLine, oEmptyLine);
        }
        SaveUndoStep();

        if (CleanEmptyLines())
        {
            BuildAllScreen2ViewVector(); // schedule full rebuild
        }
        SaveUndoStep();
        UpdateViewLineNumbers();
    }

    SetModified(); //TODO set modified only if real data was changed
    SaveUndoStep();
    CUndo::GetInstance().EndGrouping();

    BuildAllScreen2ViewVector(m_ptSelectionViewPosStart.y, m_ptSelectionViewPosEnd.y);
    SetCaretViewPosition(m_ptSelectionViewPosStart);
    UpdateGoalPos();
    ClearSelection();
    UpdateCaret();
    EnsureCaretVisible();
    Invalidate(FALSE);
}

void CBaseView::PasteText()
{
    if (!OpenClipboard())
        return;

    CString sClipboardText;
    HGLOBAL hglb = GetClipboardData(CF_TEXT);
    if (hglb)
    {
        LPCSTR lpstr   = static_cast<LPCSTR>(GlobalLock(hglb));
        sClipboardText = CString(lpstr);
        GlobalUnlock(hglb);
    }
    hglb = GetClipboardData(CF_UNICODETEXT);
    if (hglb)
    {
        LPCWSTR lpstr  = static_cast<LPCWSTR>(GlobalLock(hglb));
        sClipboardText = lpstr;
        GlobalUnlock(hglb);
    }
    CloseClipboard();

    if (sClipboardText.IsEmpty())
        return;

    sClipboardText.Replace(L"\r\n", L"\r");
    sClipboardText.Replace('\n', '\r');

    InsertText(sClipboardText);
}

void CBaseView::OnCaretDown()
{
    POINT ptCaretPos = GetCaretPosition();
    int   nLine      = ptCaretPos.y;
    int   nNextLine  = nLine + 1;
    if (nNextLine >= GetLineCount()) // already at last line
    {
        return;
    }

    POINT ptCaretViewPos = GetCaretViewPosition();
    int   nViewLine      = ptCaretViewPos.y;
    int   nNextViewLine  = GetViewLineForScreen(nNextLine);
    if (!((nNextViewLine == nViewLine) && (GetSubLineOffset(nNextLine) < CountMultiLines(nNextViewLine)))) // not on same view line
    {
        // find next suitable screen line
        while ((nNextViewLine == nViewLine) || IsViewLineHidden(nNextViewLine))
        {
            nNextLine++;
            if (nNextLine >= GetLineCount())
            {
                return;
            }
            nNextViewLine = GetViewLineForScreen(nNextLine);
        }
    }
    ptCaretPos.y = nNextLine;
    ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nCaretGoalPos, false);
    SetCaretPosition(ptCaretPos);
    OnCaretMove(MOVELEFT);
    ShowDiffLines(ptCaretPos.y);
}

bool CBaseView::MoveCaretLeft()
{
    POINT ptCaretViewPos = GetCaretViewPosition();

    //int nViewLine = ptCaretViewPos.y;
    if (ptCaretViewPos.x == 0)
    {
        int nPrevLine = GetCaretPosition().y;
        int nPrevViewLine;
        do
        {
            nPrevLine--;
            if (nPrevLine < 0)
            {
                return false;
            }
            nPrevViewLine = GetViewLineForScreen(nPrevLine);
        } while ((GetSubLineOffset(nPrevLine) >= CountMultiLines(nPrevViewLine)) || IsViewLineHidden(nPrevViewLine));
        ptCaretViewPos = ConvertScreenPosToView(SetupPoint(GetLineLength(nPrevLine), nPrevLine));
        ShowDiffLines(nPrevLine);
    }
    else
        --ptCaretViewPos.x;

    SetCaretAndGoalViewPosition(ptCaretViewPos);
    return true;
}

bool CBaseView::MoveCaretRight()
{
    POINT ptCaretViewPos = GetCaretViewPosition();

    int nViewLine    = ptCaretViewPos.y;
    int nViewLineLen = GetViewLineLength(nViewLine);
    if (ptCaretViewPos.x >= nViewLineLen)
    {
        int nNextLine = GetCaretPosition().y;
        int nNextViewLine;
        do
        {
            nNextLine++;
            if (nNextLine >= GetLineCount())
            {
                return false;
            }
            nNextViewLine = GetViewLineForScreen(nNextLine);
        } while (nNextViewLine == nViewLine || IsViewLineHidden(nNextViewLine));
        ptCaretViewPos.y = nNextViewLine;
        ptCaretViewPos.x = 0;
        ShowDiffLines(nNextLine);
    }
    else
        ++ptCaretViewPos.x;

    SetCaretAndGoalViewPosition(ptCaretViewPos);
    return true;
}

void CBaseView::UpdateGoalPos()
{
    m_nCaretGoalPos = CalculateActualOffset(GetCaretPosition());
}

void CBaseView::OnCaretLeft()
{
    MoveCaretLeft();
    OnCaretMove(MOVELEFT);
}

void CBaseView::OnCaretRight()
{
    MoveCaretRight();
    OnCaretMove(MOVERIGHT);
}

void CBaseView::OnCaretUp()
{
    POINT ptCaretPos = GetCaretPosition();
    int   nLine      = ptCaretPos.y;
    if (nLine <= 0) // already at first line
    {
        return;
    }
    int nPrevLine = nLine - 1;

    POINT ptCaretViewPos = GetCaretViewPosition();
    int   nViewLine      = ptCaretViewPos.y;
    int   nPrevViewLine  = GetViewLineForScreen(nPrevLine);
    if (nPrevViewLine != nViewLine) // not on same view line
    {
        // find previous suitable screen line
        while ((GetSubLineOffset(nPrevLine) >= CountMultiLines(nPrevViewLine)) || IsViewLineHidden(nPrevViewLine))
        {
            if (nPrevLine <= 0)
            {
                return;
            }
            nPrevLine--;
            nPrevViewLine = GetViewLineForScreen(nPrevLine);
        }
    }
    ptCaretPos.y = nPrevLine;
    ptCaretPos.x = CalculateCharIndex(ptCaretPos.y, m_nCaretGoalPos, false);
    SetCaretPosition(ptCaretPos);
    OnCaretMove(MOVELEFT);
    ShowDiffLines(ptCaretPos.y);
}

bool CBaseView::IsWordSeparator(const wchar_t ch) const
{
    switch (GetCharGroup(ch))
    {
        case CHG_CONTROL:
        case CHG_WHITESPACE:
        case CHG_WORDSEPARATOR:
            return true;
        default:
            break;
    }
    return false;
}

bool CBaseView::IsCaretAtWordBoundary() const
{
    POINT   ptViewCaret = GetCaretViewPosition();
    CString line        = GetViewLineChars(ptViewCaret.y);
    if (line.IsEmpty())
        return false; // no boundary at the empty lines
    if (ptViewCaret.x == 0)
        return !IsWordSeparator(line.GetAt(ptViewCaret.x));
    if (ptViewCaret.x >= GetViewLineLength(ptViewCaret.y))
        return !IsWordSeparator(line.GetAt(ptViewCaret.x - 1));
    return IsWordSeparator(line.GetAt(ptViewCaret.x)) !=
           IsWordSeparator(line.GetAt(ptViewCaret.x - 1));
}

void CBaseView::UpdateViewsCaretPosition()
{
    POINT ptCaretPos = GetCaretPosition();
    if (m_pwndBottom && m_pwndBottom != this)
        m_pwndBottom->UpdateCaretPosition(ptCaretPos);
    if (m_pwndLeft && m_pwndLeft != this)
        m_pwndLeft->UpdateCaretPosition(ptCaretPos);
    if (m_pwndRight && m_pwndRight != this)
        m_pwndRight->UpdateCaretPosition(ptCaretPos);
}

void CBaseView::OnCaretWordleft()
{
    MoveCaretWordLeft();
    OnCaretMove(MOVELEFT);
}

void CBaseView::OnCaretWordright()
{
    MoveCaretWordRight();
    OnCaretMove(MOVERIGHT);
}

void CBaseView::MoveCaretWordLeft()
{
    while (MoveCaretLeft() && !IsCaretAtWordBoundary())
    {
    }
}

void CBaseView::MoveCaretWordRight()
{
    while (MoveCaretRight() && !IsCaretAtWordBoundary())
    {
    }
}

void CBaseView::ClearCurrentSelection()
{
    m_ptSelectionViewPosStart  = GetCaretViewPosition();
    m_ptSelectionViewPosEnd    = m_ptSelectionViewPosStart;
    m_ptSelectionViewPosOrigin = m_ptSelectionViewPosStart;
    m_nSelViewBlockStart       = -1;
    m_nSelViewBlockEnd         = -1;
    Invalidate(FALSE);
}

void CBaseView::ClearSelection()
{
    if (m_pwndLeft)
        m_pwndLeft->ClearCurrentSelection();
    if (m_pwndRight)
        m_pwndRight->ClearCurrentSelection();
    if (m_pwndBottom)
        m_pwndBottom->ClearCurrentSelection();
}

void CBaseView::AdjustSelection(bool bMoveLeft)
{
    POINT ptCaretViewPos = GetCaretViewPosition();
    if (ArePointsSame(m_ptSelectionViewPosOrigin, SetupPoint(-1, -1)))
    {
        // select all have been used recently update origin
        m_ptSelectionViewPosOrigin = bMoveLeft ? m_ptSelectionViewPosEnd : m_ptSelectionViewPosStart;
    }
    if ((ptCaretViewPos.y < m_ptSelectionViewPosOrigin.y) ||
        (ptCaretViewPos.y == m_ptSelectionViewPosOrigin.y && ptCaretViewPos.x <= m_ptSelectionViewPosOrigin.x))
    {
        m_ptSelectionViewPosStart = ptCaretViewPos;
        m_ptSelectionViewPosEnd   = m_ptSelectionViewPosOrigin;
    }
    else
    {
        m_ptSelectionViewPosStart = m_ptSelectionViewPosOrigin;
        m_ptSelectionViewPosEnd   = ptCaretViewPos;
    }

    SetupAllViewSelection(m_ptSelectionViewPosStart.y, m_ptSelectionViewPosEnd.y);

    Invalidate(FALSE);
}

void CBaseView::OnEditCut()
{
    if (IsWritable())
    {
        OnEditCopy();
        RemoveSelectedText();
    }
}

void CBaseView::OnEditPaste()
{
    if (IsWritable())
    {
        CUndo::GetInstance().BeginGrouping();
        RemoveSelectedText();
        PasteText();
        CUndo::GetInstance().EndGrouping();
    }
}

void CBaseView::DeleteFonts()
{
    for (int i = 0; i < m_fontsCount; i++)
    {
        if (m_apFonts[i])
        {
            m_apFonts[i]->DeleteObject();
            delete m_apFonts[i];
            m_apFonts[i] = nullptr;
        }
    }
}

void CBaseView::OnCaretMove(bool bMoveLeft)
{
    bool bShift = !!(GetKeyState(VK_SHIFT) & 0x8000);
    OnCaretMove(bMoveLeft, bShift);
}

void CBaseView::OnCaretMove(bool bMoveLeft, bool isShiftPressed)
{
    if (isShiftPressed)
        AdjustSelection(bMoveLeft);
    else
        ClearSelection();
    EnsureCaretVisible();
    UpdateCaret();
}

void CBaseView::AddContextItems(CIconMenu& popup, DiffStates /*state*/)
{
    AddCutCopyAndPaste(popup);
}

void CBaseView::AddCutCopyAndPaste(CIconMenu& popup) const
{
    popup.AppendMenu(MF_SEPARATOR, NULL);
    CString temp;
    temp.LoadString(IDS_EDIT_COPY);
    popup.AppendMenu(MF_STRING | (HasTextSelection() ? MF_ENABLED : MF_DISABLED | MF_GRAYED), ID_EDIT_COPY, temp);
    if (IsWritable())
    {
        temp.LoadString(IDS_EDIT_CUT);
        popup.AppendMenu(MF_STRING | (HasTextSelection() ? MF_ENABLED : MF_DISABLED | MF_GRAYED), ID_EDIT_CUT, temp);
        temp.LoadString(IDS_EDIT_PASTE);
        popup.AppendMenu(MF_STRING | (CAppUtils::HasClipboardFormat(CF_UNICODETEXT) || CAppUtils::HasClipboardFormat(CF_TEXT) ? MF_ENABLED : MF_DISABLED | MF_GRAYED), ID_EDIT_PASTE, temp);
        popup.AppendMenu(MF_SEPARATOR, NULL);
    }
}

void CBaseView::CompensateForKeyboard(CPoint& point) const
{
    // if the context menu is invoked through the keyboard, we have to use
    // a calculated position on where to anchor the menu on
    if (ArePointsSame(point, SetupPoint(-1, -1)))
    {
        CRect rect;
        GetWindowRect(&rect);
        point = rect.CenterPoint();
    }
}

void CBaseView::ReleaseBitmap()
{
    if (m_pCacheBitmap)
    {
        m_pCacheBitmap->DeleteObject();
        delete m_pCacheBitmap;
        m_pCacheBitmap = nullptr;
    }
}

void CBaseView::BuildMarkedWordArray()
{
    int lineCount = GetLineCount();
    m_arMarkedWordLines.clear();
    m_arMarkedWordLines.reserve(lineCount);
    bool bDoit        = !m_sMarkedWord.IsEmpty();
    m_markedWordCount = 0;
    for (int i = 0; i < lineCount; ++i)
    {
        if (bDoit)
        {
            CString line = GetLineChars(i);

            if (!line.IsEmpty())
            {
                int found      = 0;
                int nMarkStart = -1;
                while ((nMarkStart = line.Find(m_sMarkedWord, ++nMarkStart)) >= 0)
                {
                    int        nMarkEnd = nMarkStart + m_sMarkedWord.GetLength();
                    ECharGroup eLeft    = GetCharGroup(line, nMarkStart - 1);
                    ECharGroup eStart   = GetCharGroup(line, nMarkStart);
                    if (eLeft != eStart)
                    {
                        ECharGroup eRight = GetCharGroup(line, nMarkEnd);
                        ECharGroup eEnd   = GetCharGroup(line, nMarkEnd - 1);
                        if (eRight != eEnd)
                        {
                            found = 1;
                            ++m_markedWordCount;
                            break;
                        }
                    }
                }
                m_arMarkedWordLines.push_back(found);
            }
            else
                m_arMarkedWordLines.push_back(0);
        }
        else
            m_arMarkedWordLines.push_back(0);
    }
}

void CBaseView::BuildFindStringArray()
{
    int lineCount = GetLineCount();
    m_arFindStringLines.clear();
    m_arFindStringLines.reserve(lineCount);
    bool bDoit = !m_sFindText.IsEmpty();
    int  s     = 0;
    int  e     = 0;
    for (int i = 0; i < lineCount; ++i)
    {
        if (bDoit)
        {
            CString line = GetLineChars(i);

            if (!line.IsEmpty())
            {
                switch (m_pViewData->GetState(GetViewLineForScreen(i)))
                {
                    case DIFFSTATE_EMPTY:
                        m_arFindStringLines.push_back(0);
                        break;
                    case DIFFSTATE_UNKNOWN:
                    case DIFFSTATE_NORMAL:
                    case DIFFSTATE_FILTEREDDIFF:
                        if (m_bLimitToDiff)
                        {
                            m_arFindStringLines.push_back(0);
                            break;
                        }
                    case DIFFSTATE_REMOVED:
                    case DIFFSTATE_REMOVEDWHITESPACE:
                    case DIFFSTATE_ADDED:
                    case DIFFSTATE_ADDEDWHITESPACE:
                    case DIFFSTATE_WHITESPACE:
                    case DIFFSTATE_WHITESPACE_DIFF:
                    case DIFFSTATE_CONFLICTED:
                    case DIFFSTATE_CONFLICTED_IGNORED:
                    case DIFFSTATE_CONFLICTADDED:
                    case DIFFSTATE_CONFLICTEMPTY:
                    case DIFFSTATE_CONFLICTRESOLVED:
                    case DIFFSTATE_IDENTICALREMOVED:
                    case DIFFSTATE_IDENTICALADDED:
                    case DIFFSTATE_THEIRSREMOVED:
                    case DIFFSTATE_THEIRSADDED:
                    case DIFFSTATE_YOURSREMOVED:
                    case DIFFSTATE_YOURSADDED:
                    case DIFFSTATE_EDITED:
                    {
                        if (!m_bMatchCase)
                            line = line.MakeLower();
                        s         = 0;
                        e         = 0;
                        int match = 0;
                        while (StringFound(line, SearchNext, s, e))
                        {
                            match++;
                            s = e;
                            e = 0;
                        }
                        m_arFindStringLines.push_back(match);
                        break;
                    }
                    default:
                        m_arFindStringLines.push_back(0);
                }
            }
            else
                m_arFindStringLines.push_back(0);
        }
        else
            m_arFindStringLines.push_back(0);
    }
    UpdateLocator();
}

bool CBaseView::GetInlineDiffPositions(int nViewLine, std::vector<InlineDiffPos>& positions)
{
    if (!m_bShowInlineDiff)
        return false;
    if (m_pwndBottom && !(m_pwndBottom->IsHidden()))
        return false;

    if (!m_pViewData || m_pViewData->GetCount() <= nViewLine)
        return false;
    const CString& sLine = m_pViewData->GetLine(nViewLine);
    if (sLine.IsEmpty())
        return false;

    CheckOtherView();
    if (!m_pOtherViewData)
        return false;

    const CString& sDiffLine = m_pOtherViewData->GetLine(nViewLine);
    if (sDiffLine.IsEmpty())
        return false;

    svn_diff_t* diff   = nullptr;
    auto        pLine1 = (this == m_pwndLeft) ? &sLine : &sDiffLine;
    auto        pLine2 = (this == m_pwndLeft) ? &sDiffLine : &sLine;
    m_svnlinediff.Diff(&diff, *pLine1, pLine1->GetLength(), *pLine2, pLine2->GetLength(), m_bInlineWordDiff);
    if (!diff || !SVNLineDiff::ShowInlineDiff(diff))
        return false;

    size_t lineOffset = 0;
    size_t position   = 0;
    while (diff)
    {
        if (this == m_pwndRight)
        {
            apr_off_t nTmp        = diff->modified_length;
            diff->modified_length = diff->original_length;
            diff->original_length = nTmp;

            nTmp                 = diff->modified_start;
            diff->modified_start = diff->original_start;
            diff->original_start = nTmp;
        }

        apr_off_t len    = diff->original_length;
        size_t    oldpos = position;

        for (apr_off_t i = 0; i < len; ++i)
        {
            position += (this == m_pwndRight) ? m_svnlinediff.m_line2Tokens[lineOffset].size() : m_svnlinediff.m_line1Tokens[lineOffset].size();
            lineOffset++;
        }

        if (diff->type == svn_diff__type_diff_modified)
        {
            InlineDiffPos p;
            p.start = oldpos;
            p.end   = position;
            positions.push_back(p);
        }

        diff = diff->next;
    }

    return !positions.empty();
}

void CBaseView::OnNavigateNextinlinediff()
{
    int nX = 0;
    if (GetNextInlineDiff(nX))
    {
        POINT ptCaretViewPos = GetCaretViewPosition();
        ptCaretViewPos.x     = nX;
        SetCaretAndGoalViewPosition(ptCaretViewPos);
        m_ptSelectionViewPosOrigin = ptCaretViewPos;
        EnsureCaretVisible();
    }
}

void CBaseView::OnNavigatePrevinlinediff()
{
    int nX = 0;
    if (GetPrevInlineDiff(nX))
    {
        POINT ptCaretViewPos = GetCaretViewPosition();
        ptCaretViewPos.x     = nX;
        SetCaretAndGoalViewPosition(ptCaretViewPos);
        m_ptSelectionViewPosOrigin = ptCaretViewPos;
        EnsureCaretVisible();
    }
}

bool CBaseView::HasNextInlineDiff()
{
    int nPos;
    return GetNextInlineDiff(nPos);
}

bool CBaseView::GetNextInlineDiff(int& nPos)
{
    POINT                      ptCaretViewPos = GetCaretViewPosition();
    std::vector<InlineDiffPos> positions;
    if (GetInlineDiffPositions(ptCaretViewPos.y, positions))
    {
        for (const auto& [start, end] : positions)
        {
            if (start > ptCaretViewPos.x)
            {
                nPos = static_cast<LONG>(start);
                return true;
            }
            if (end > ptCaretViewPos.x)
            {
                nPos = static_cast<LONG>(end);
                return true;
            }
        }
    }
    return false;
}

bool CBaseView::HasPrevInlineDiff()
{
    int nPos;
    return GetPrevInlineDiff(nPos);
}

bool CBaseView::GetPrevInlineDiff(int& nPos)
{
    POINT                      ptCaretViewPos = GetCaretViewPosition();
    std::vector<InlineDiffPos> positions;
    if (GetInlineDiffPositions(ptCaretViewPos.y, positions))
    {
        for (auto it = positions.crbegin(); it != positions.crend(); ++it)
        {
            if (it->end < ptCaretViewPos.x)
            {
                nPos = static_cast<LONG>(it->end);
                return true;
            }
            if (it->start < ptCaretViewPos.x)
            {
                nPos = static_cast<LONG>(it->start);
                return true;
            }
        }
    }
    return false;
}

CBaseView* CBaseView::GetFirstGoodView()
{
    if (IsViewGood(m_pwndLeft))
        return m_pwndLeft;
    if (IsViewGood(m_pwndRight))
        return m_pwndRight;
    if (IsViewGood(m_pwndBottom))
        return m_pwndBottom;
    return nullptr;
}

void CBaseView::BuildAllScreen2ViewVector()
{
    CBaseView* p_pwndView = GetFirstGoodView();
    if (p_pwndView)
    {
        m_screen2View.ScheduleFullRebuild(p_pwndView->m_pViewData);
    }
}

void CBaseView::BuildAllScreen2ViewVector(int nViewLine)
{
    BuildAllScreen2ViewVector(nViewLine, nViewLine);
}

void CBaseView::BuildAllScreen2ViewVector(int nFirstViewLine, int nLastViewLine)
{
    CBaseView* p_pwndView = GetFirstGoodView();
    if (p_pwndView)
    {
        m_screen2View.ScheduleRangeRebuild(p_pwndView->m_pViewData, nFirstViewLine, nLastViewLine);
    }
}

void CBaseView::UpdateViewLineNumbers()
{
    int nLineNumber    = 0;
    int nViewLineCount = GetViewCount();
    for (int nViewLine = 0; nViewLine < nViewLineCount; nViewLine++)
    {
        int oldLine = static_cast<int>(GetViewLineNumber(nViewLine));
        if (oldLine >= 0)
            SetViewLineNumber(nViewLine, nLineNumber++);
    }
    m_nDigits = 0;
}

int CBaseView::CleanEmptyLines() const
{
    int  nRemovedCount  = 0;
    int  nViewLineCount = GetViewCount();
    bool bCheckLeft     = IsViewGood(m_pwndLeft);
    bool bCheckRight    = IsViewGood(m_pwndRight);
    bool bCheckBottom   = IsViewGood(m_pwndBottom);
    for (int nViewLine = 0; nViewLine < nViewLineCount;)
    {
        bool bAllEmpty = true;
        bAllEmpty &= !bCheckLeft || IsStateEmpty(m_pwndLeft->GetViewState(nViewLine));
        bAllEmpty &= !bCheckRight || IsStateEmpty(m_pwndRight->GetViewState(nViewLine));
        bAllEmpty &= !bCheckBottom || IsStateEmpty(m_pwndBottom->GetViewState(nViewLine));
        if (bAllEmpty)
        {
            if (bCheckLeft)
            {
                m_pwndLeft->RemoveViewData(nViewLine);
            }
            if (bCheckRight)
            {
                m_pwndRight->RemoveViewData(nViewLine);
            }
            if (bCheckBottom)
            {
                m_pwndBottom->RemoveViewData(nViewLine);
            }
            if (CUndo::GetInstance().IsGrouping()) // if use group undo -> ensure back adding goes in right (reversed) order
            {
                SaveUndoStep();
            }
            nViewLineCount--;
            nRemovedCount++;
            continue;
        }
        nViewLine++;
    }
    return nRemovedCount;
}

int CBaseView::FindScreenLineForViewLine(int viewLine)
{
    return m_screen2View.FindScreenLineForViewLine(viewLine);
}

int CBaseView::CountMultiLines(int nViewLine)
{
    if (m_screenedViewLine.empty())
        return 0; // in case the view is completely empty

    ASSERT(nViewLine < static_cast<int>(m_screenedViewLine.size()));

    if (m_screenedViewLine[nViewLine].bSublinesSet)
    {
        return static_cast<int>(m_screenedViewLine[nViewLine].m_subLines.size());
    }

    auto              multiLines = CStringUtils::WordWrap(m_pViewData->GetLine(nViewLine), GetScreenChars() - 1, GetTabSize());

    TScreenedViewLine oScreenedLine;
    bool              subLinesSet = true;
    if (m_pMainFrame->m_bWrapLines)
    {
        CDC*   pDC      = GetDC();
        CFont* pOldFont = pDC->SelectObject(GetFont());

        for (const auto& line : multiLines)
        {
            if (line.GetLength())
            {
                // we use the 'X' char to determine the char width,
                // but e.g. chinese chars are much wider. To make sure
                // that we wrap correctly, we calculate the average char width
                // here by using the real line text
                const CSize szCharExt = pDC->GetTextExtent(line);
                if (szCharExt.cx / line.GetLength() > m_nCharWidth)
                {
                    m_nCharWidth = szCharExt.cx / line.GetLength();
                    subLinesSet  = false;
                }
            }
            oScreenedLine.m_subLines.push_back(line);
        }
        pDC->SelectObject(pOldFont);
        ReleaseDC(pDC);
    }
    else
    {
        for (const auto& line : multiLines)
        {
            oScreenedLine.m_subLines.push_back(line);
        }
    }

    oScreenedLine.bSublinesSet    = subLinesSet;
    m_screenedViewLine[nViewLine] = oScreenedLine;

    return CountMultiLines(nViewLine);
}

/// prepare inline diff cache
LineColors& CBaseView::GetLineColors(int nViewLine)
{
    ASSERT(nViewLine < static_cast<int>(m_screenedViewLine.size()));

    if (m_bWhitespaceInlineDiffs)
    {
        if (m_screenedViewLine[nViewLine].bLineColorsSetWhiteSpace)
            return m_screenedViewLine[nViewLine].lineColorsWhiteSpace;
    }
    else
    {
        if (m_screenedViewLine[nViewLine].bLineColorsSet)
            return m_screenedViewLine[nViewLine].lineColors;
    }

    LineColors oLineColors;
    // set main line color
    COLORREF   crBkgnd, crText;
    DiffStates diffState = m_pViewData->GetState(nViewLine);
    CDiffColors::GetInstance().GetColors(diffState, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBkgnd, crText);
    oLineColors.SetColor(0, crText, crBkgnd);

    do
    {
        if (!m_bShowInlineDiff)
            break;

        if (((diffState == DIFFSTATE_NORMAL) || (diffState == DIFFSTATE_FILTEREDDIFF)) && (!m_bWhitespaceInlineDiffs))
            break;

        CString sLine = GetViewLineChars(nViewLine);
        if (sLine.IsEmpty())
            break;
        CString sDiffLine;
        if (!m_pOtherView)
        {
            switch (diffState)
            {
                case DIFFSTATE_ADDED:
                {
                    if ((nViewLine > 0) && (m_pViewData->GetState(nViewLine - 1) == DIFFSTATE_REMOVED))
                        sDiffLine = GetViewLineChars(nViewLine - 1);
                }
                break;
                case DIFFSTATE_REMOVED:
                {
                    if (((nViewLine + 1) < m_pViewData->GetCount()) && (m_pViewData->GetState(nViewLine + 1) == DIFFSTATE_ADDED))
                        sDiffLine = GetViewLineChars(nViewLine + 1);
                }
                break;
                default:
                    break;
            }
        }
        else
            sDiffLine = m_pOtherView->GetViewLineChars(nViewLine);
        if (sDiffLine.IsEmpty())
            break;

        svn_diff_t* diff = nullptr;
        if (sLine.GetLength() > static_cast<int>(m_nInlineDiffMaxLineLength))
            break;
        auto pLine1 = (this == m_pwndLeft) ? &sLine : &sDiffLine;
        auto pLine2 = (this == m_pwndLeft) ? &sDiffLine : &sLine;
        m_svnlinediff.Diff(&diff, *pLine1, pLine1->GetLength(), *pLine2, pLine2->GetLength(), m_bInlineWordDiff);
        if (!diff || !SVNLineDiff::ShowInlineDiff(diff) || !diff->next)
            break;

        int                     lineoffset       = 0;
        int                     nTextStartOffset = 0;
        std::map<int, COLORREF> removedPositions;
        while (diff)
        {
            if (this == m_pwndRight)
            {
                apr_off_t nTmp        = diff->modified_length;
                diff->modified_length = diff->original_length;
                diff->original_length = nTmp;

                nTmp                 = diff->modified_start;
                diff->modified_start = diff->original_start;
                diff->original_start = nTmp;
            }
            apr_off_t len = diff->original_length;

            size_t nTextLength = 0;
            for (int i = 0; i < len; ++i)
            {
                nTextLength += (this == m_pwndRight) ? m_svnlinediff.m_line2Tokens[lineoffset].size() : m_svnlinediff.m_line1Tokens[lineoffset].size();
                lineoffset++;
            }
            bool bInlineDiff = (diff->type == svn_diff__type_diff_modified);

            CDiffColors::GetInstance().GetColors(diffState, CTheme::Instance().IsDarkTheme() || CTheme::Instance().IsHighContrastModeDark(), crBkgnd, crText);
            if ((m_bShowInlineDiff) && (bInlineDiff))
            {
                crBkgnd = InlineViewLineDiffColor(nViewLine);
            }
            else if (m_pOtherView)
            {
                crBkgnd = m_bDark ? m_modifiedDarkBk : m_modifiedBk;
            }

            if (len < diff->modified_length)
            {
                removedPositions[nTextStartOffset] = m_bDark ? m_inlineRemovedDarkBk : m_inlineRemovedBk;
            }
            oLineColors.SetColor(nTextStartOffset, crText, crBkgnd);

            nTextStartOffset += static_cast<int>(nTextLength);
            diff = diff->next;
        }
        for (const auto& [pos, color] : removedPositions)
        {
            oLineColors.AddShotColor(pos, color);
        }
    } while (false); // error catch

    if (!m_bWhitespaceInlineDiffs)
    {
        m_screenedViewLine[nViewLine].lineColors     = oLineColors;
        m_screenedViewLine[nViewLine].bLineColorsSet = true;
    }
    else
    {
        m_screenedViewLine[nViewLine].lineColorsWhiteSpace     = oLineColors;
        m_screenedViewLine[nViewLine].bLineColorsSetWhiteSpace = true;
    }

    return GetLineColors(nViewLine);
}

void CBaseView::OnEditSelectall()
{
    if (!m_pViewData)
        return;
    int nLastViewLine = m_pViewData->GetCount() - 1;
    if (nLastViewLine < 0)
        return;
    SetupAllViewSelection(0, nLastViewLine);

    CString sLine              = GetViewLineChars(nLastViewLine);
    m_ptSelectionViewPosStart  = SetupPoint(0, 0);
    m_ptSelectionViewPosEnd    = SetupPoint(sLine.GetLength(), nLastViewLine);
    m_ptSelectionViewPosOrigin = SetupPoint(-1, -1);

    UpdateWindow();
}

void CBaseView::FilterWhitespaces(CString& first, CString& second)
{
    FilterWhitespaces(first);
    FilterWhitespaces(second);
}

void CBaseView::FilterWhitespaces(CString& line)
{
    line.Remove(' ');
    line.Remove('\t');
    line.Remove('\r');
    line.Remove('\n');
}

int CBaseView::GetButtonEventLineIndex(const POINT& point)
{
    if (point.y < (GetLineHeight() + HEADERHEIGHT))
        return -1;
    const int nLineFromTop = (point.y - HEADERHEIGHT) / GetLineHeight();
    int       nEventLine   = nLineFromTop + m_nTopLine;
    nEventLine--; //we need the index
    return nEventLine;
}

BOOL CBaseView::PreTranslateMessage(MSG* pMsg)
{
    if (RelayTrippleClick(pMsg))
        return TRUE;
    return CView::PreTranslateMessage(pMsg);
}

ULONG CBaseView::GetGestureStatus(CPoint /*ptTouch*/)
{
    return 0;
}

void CBaseView::ResetUndoStep()
{
    m_allState.Clear();
}

void CBaseView::SaveUndoStep() const
{
    if (!m_allState.IsEmpty())
    {
        CUndo::GetInstance().AddState(m_allState, GetCaretViewPosition());
    }
    ResetUndoStep();
}

void CBaseView::SetTheme(bool bDark)
{
    m_bDark = bDark || CTheme::Instance().IsHighContrastModeDark();
    DarkModeHelper::Instance().AllowDarkModeForWindow(GetSafeHwnd(), m_bDark);
    if (m_bDark)
        ModifyStyleEx(WS_EX_CLIENTEDGE, 0);
    else
        ModifyStyleEx(0, WS_EX_CLIENTEDGE);
    CDiffColors::GetInstance().LoadRegistry();
    BuildAllScreen2ViewVector();
    if (IsWindow(GetSafeHwnd()))
    {
        if (m_bDark)
        {
            if (FAILED(SetWindowTheme(GetSafeHwnd(), L"DarkMode_Explorer", nullptr)))
                SetWindowTheme(GetSafeHwnd(), L"Explorer", nullptr);
        }
        else
        {
            SetWindowTheme(GetSafeHwnd(), L"Explorer", nullptr);
        }
        Invalidate();
    }
    m_whiteSpaceFg = CRegDWORD(L"Software\\TortoiseMerge\\Colors\\Whitespace", CTheme::Instance().GetThemeColor(GetSysColor(COLOR_3DSHADOW)));
}

void CBaseView::InsertViewData(int index, const CString& sLine, DiffStates state, int linenumber, EOL ending, HideState hide, int movedline) const
{
    m_pState->addedLines.push_back(index);
    m_pViewData->InsertData(index, sLine, state, linenumber, ending, hide, movedline);
}

void CBaseView::InsertViewData(int index, const ViewData& data) const
{
    m_pState->addedLines.push_back(index);
    m_pViewData->InsertData(index, data);
}

void CBaseView::RemoveViewData(int index) const
{
    m_pState->removedLines[index] = m_pViewData->GetData(index);
    m_pViewData->RemoveData(index);
}

void CBaseView::SetViewData(int index, const ViewData& data) const
{
    m_pState->replacedLines[index] = m_pViewData->GetData(index);
    m_pViewData->SetData(index, data);
}

void CBaseView::SetViewState(int index, DiffStates state) const
{
    m_pState->lineStates[index] = m_pViewData->GetState(index);
    m_pViewData->SetState(index, state);
}

void CBaseView::SetViewLine(int index, const CString& sLine) const
{
    m_pState->diffLines[index] = m_pViewData->GetLine(index);
    m_pViewData->SetLine(index, sLine);
}

void CBaseView::SetViewLineNumber(int index, int linenumber) const
{
    int oldLineNumber = m_pViewData->GetLineNumber(index);
    if (oldLineNumber != linenumber)
    {
        m_pState->lineLines[index] = oldLineNumber;
        m_pViewData->SetLineNumber(index, linenumber);
    }
}

void CBaseView::SetViewLineEnding(int index, EOL ending) const
{
    m_pState->linesEOL[index] = m_pViewData->GetLineEnding(index);
    m_pViewData->SetLineEnding(index, ending);
}

void CBaseView::SetViewMarked(int index, bool marked) const
{
    m_pState->markedLines[index] = m_pViewData->GetMarked(index);
    m_pViewData->SetMarked(index, marked);
}

BOOL CBaseView::GetViewSelection(int& start, int& end) const
{
    if (HasSelection())
    {
        start = m_nSelViewBlockStart;
        end   = m_nSelViewBlockEnd;
        return true;
    }
    return false;
}

int CBaseView::Screen2View::GetViewLineForScreen(int screenLine)
{
    RebuildIfNecessary();
    if ((size() <= screenLine) || (screenLine < 0))
        return 0;
    return m_screen2View[screenLine].nViewLine;
}

int CBaseView::Screen2View::size()
{
    RebuildIfNecessary();
    return static_cast<int>(m_screen2View.size());
}

int CBaseView::Screen2View::GetSubLineOffset(int screenLine)
{
    RebuildIfNecessary();
    if (size() <= screenLine)
        return 0;
    return m_screen2View[screenLine].nViewSubLine;
}

/**
    doing partial rebuild, whole screen2view vector is built, but uses ScreenedViewLine cache to do it faster
*/
void CBaseView::Screen2View::RebuildIfNecessary()
{
    if (!m_pViewData)
        return; // rebuild not necessary

    FixScreenedCacheSize(m_pwndLeft);
    FixScreenedCacheSize(m_pwndRight);
    FixScreenedCacheSize(m_pwndBottom);
    if (!m_bFull)
    {
        for (const auto& range : m_rebuildRanges)
        {
            ResetScreenedViewLineCache(m_pwndLeft, range);
            ResetScreenedViewLineCache(m_pwndRight, range);
            ResetScreenedViewLineCache(m_pwndBottom, range);
        }
    }
    else
    {
        ResetScreenedViewLineCache(m_pwndLeft);
        ResetScreenedViewLineCache(m_pwndRight);
        ResetScreenedViewLineCache(m_pwndBottom);
    }
    m_rebuildRanges.clear();
    m_bFull = false;

    size_t oldSize = m_screen2View.size();
    m_screen2View.clear();
    m_screen2View.reserve(oldSize); // guess same size
    for (int i = 0; i < m_pViewData->GetCount(); ++i)
    {
        if (m_pMainFrame->m_bCollapsed)
        {
            while ((i < m_pViewData->GetCount()) && (m_pViewData->GetHideState(i) == HIDESTATE_HIDDEN))
                ++i;
            if (!(i < m_pViewData->GetCount()))
                break;
        }
        TScreenLineInfo oLineInfo;
        oLineInfo.nViewLine    = i;
        oLineInfo.nViewSubLine = -1; // no wrap
        if (m_pMainFrame->m_bWrapLines && !IsViewLineHidden(m_pViewData, i))
        {
            int nMaxLines = 0;
            if (IsLeftViewGood())
                nMaxLines = std::max<int>(nMaxLines, m_pwndLeft->CountMultiLines(i));
            if (IsRightViewGood())
                nMaxLines = std::max<int>(nMaxLines, m_pwndRight->CountMultiLines(i));
            if (IsBottomViewGood())
                nMaxLines = std::max<int>(nMaxLines, m_pwndBottom->CountMultiLines(i));
            for (int l = 0; l < (nMaxLines - 1); ++l)
            {
                oLineInfo.nViewSubLine++;
                m_screen2View.push_back(oLineInfo);
            }
            oLineInfo.nViewSubLine++;
        }
        m_screen2View.push_back(oLineInfo);
    }
    m_pViewData = nullptr;

    if (IsLeftViewGood())
        m_pwndLeft->BuildMarkedWordArray();
    if (IsRightViewGood())
        m_pwndRight->BuildMarkedWordArray();
    if (IsBottomViewGood())
        m_pwndBottom->BuildMarkedWordArray();
    UpdateLocator();
    RecalcAllVertScrollBars();
    RecalcAllHorzScrollBars();
}

int CBaseView::Screen2View::FindScreenLineForViewLine(int viewLine)
{
    RebuildIfNecessary();

    int nScreenLineCount = static_cast<int>(m_screen2View.size());

    int nPos = 0;
    if (nScreenLineCount > 16)
    {
        // for enough long data search for last screen
        // with viewline less than one we are looking for
        // use approximate method (based on) binary search using asymmetric start point
        // in form 2**n (determined as MSB of length) to go around division and rounding;
        // this effectively looks for bit values from MSB to LSB

        //GetMostSignificantBitValue
        // note _BitScanReverse(&nTestBit, nScreenLineCount); can be used instead
        int nTestBit = nScreenLineCount;
        nTestBit |= nTestBit >> 1;
        nTestBit |= nTestBit >> 2;
        nTestBit |= nTestBit >> 4;
        nTestBit |= nTestBit >> 8;
        nTestBit |= nTestBit >> 16;
        nTestBit ^= (nTestBit >> 1);

        while (nTestBit)
        {
            int nTestPos = nPos | nTestBit;
            if (nTestPos < nScreenLineCount && m_screen2View[nTestPos].nViewLine < viewLine)
            {
                nPos = nTestPos;
            }
            nTestBit >>= 1;
        }
    }
    while (nPos < nScreenLineCount && m_screen2View[nPos].nViewLine < viewLine)
    {
        nPos++;
    }

    return nPos;
}

void CBaseView::Screen2View::ScheduleFullRebuild(CViewData* pViewData)
{
    m_bFull = true;

    m_pViewData = pViewData;
}

void CBaseView::Screen2View::ScheduleRangeRebuild(CViewData* pViewData, int nFirstViewLine, int nLastViewLine)
{
    if (m_bFull)
        return;

    m_pViewData = pViewData;

    TRebuildRange range;
    range.firstViewLine = nFirstViewLine;
    range.lastViewLine  = nLastViewLine;
    m_rebuildRanges.push_back(range);
}

bool CBaseView::Screen2View::FixScreenedCacheSize(CBaseView* pwndView) const
{
    if (!IsViewGood(pwndView))
    {
        return false;
    }
    const int nOldSize   = static_cast<int>(pwndView->m_screenedViewLine.size());
    const int nViewCount = std::max<int>(pwndView->GetViewCount(), 0);
    if (nOldSize == nViewCount)
    {
        return false;
    }
    pwndView->m_screenedViewLine.resize(nViewCount);
    return true;
}

bool CBaseView::Screen2View::ResetScreenedViewLineCache(CBaseView* pwndView) const
{
    if (!IsViewGood(pwndView))
    {
        return false;
    }
    TRebuildRange range = {0, pwndView->GetViewCount() - 1};
    ResetScreenedViewLineCache(pwndView, range);
    return true;
}

bool CBaseView::Screen2View::ResetScreenedViewLineCache(CBaseView* pwndView, const TRebuildRange& range)
{
    if (!IsViewGood(pwndView))
    {
        return false;
    }
    if (range.lastViewLine == -1)
    {
        return false;
    }
    ASSERT(range.firstViewLine >= 0);
    ASSERT(range.lastViewLine < pwndView->GetViewCount());
    for (int i = range.firstViewLine; i <= range.lastViewLine; i++)
    {
        pwndView->m_screenedViewLine[i].Clear();
    }
    return false;
}

void CBaseView::WrapChanged()
{
    m_nMaxLineLength = -1;
    m_nOffsetChar    = 0;
    RecalcHorzScrollBar();
}

void CBaseView::OnEditFind()
{
    if (m_pFindDialog)
    {
        m_pFindDialog->SetFocus();
        return;
    }

    int id = 0;
    if (this == m_pwndLeft)
        id = 1;
    if (this == m_pwndRight)
        id = 2;
    if (this == m_pwndBottom)
        id = 3;

    m_pFindDialog = new CFindDlg(this);
    m_pFindDialog->Create(this, id);

    m_pFindDialog->SetFindString(HasTextSelection() ? GetSelectedText() : CString());
    m_pFindDialog->SetReadonly(m_bReadonly);
}

LRESULT CBaseView::OnFindDialogMessage(WPARAM wParam, LPARAM /*lParam*/)
{
    ASSERT(m_pFindDialog != nullptr);

    if (m_pFindDialog->IsTerminating())
    {
        // invalidate the handle identifying the dialog box.
        m_pFindDialog = nullptr;
        return 0;
    }

    if (m_pFindDialog->FindNext())
    {
        //read data from dialog
        m_sFindText    = m_pFindDialog->GetFindString();
        m_bMatchCase   = (m_pFindDialog->MatchCase() == TRUE);
        m_bLimitToDiff = m_pFindDialog->LimitToDiffs();
        m_bWholeWord   = m_pFindDialog->WholeWord();

        if (!m_bMatchCase)
            m_sFindText = m_sFindText.MakeLower();

        BuildFindStringArray();
        if (static_cast<CFindDlg::FindType>(wParam) == CFindDlg::FindType::Find)
        {
            if (m_pFindDialog->SearchUp())
                OnEditFindprev();
            else
                OnEditFindnext();
        }
        else if (static_cast<CFindDlg::FindType>(wParam) == CFindDlg::FindType::Count)
        {
            size_t count = 0;
            for (size_t i = 0; i < m_arFindStringLines.size(); ++i)
                count += m_arFindStringLines[i];
            CString matches;
            matches.Format(IDS_FIND_COUNT, count);
            m_pFindDialog->SetStatusText(matches);
        }
        else if (static_cast<CFindDlg::FindType>(wParam) == CFindDlg::FindType::Replace)
        {
            if (!IsWritable())
                return 0;
            bool bFound = false;
            if (m_pFindDialog->SearchUp())
                bFound = Search(SearchPrevious, true, true, false);
            else
                bFound = Search(SearchNext, true, true, false);
            if (bFound)
            {
                CString sReplaceText = m_pFindDialog->GetReplaceString();
                CUndo::GetInstance().BeginGrouping();
                RemoveSelectedText();
                InsertText(sReplaceText);
                CUndo::GetInstance().EndGrouping();
            }
        }
        else if (static_cast<CFindDlg::FindType>(wParam) == CFindDlg::FindType::ReplaceAll)
        {
            if (!IsWritable())
                return 0;
            bool  bFound                = false;
            int   replaceCount          = 0;
            POINT lastPoint             = m_ptSelectionViewPosStart;
            m_ptSelectionViewPosStart.x = m_ptSelectionViewPosStart.y = 0;
            CUndo::GetInstance().BeginGrouping();
            do
            {
                bFound = Search(SearchNext, true, false, true);
                if (bFound)
                {
                    CString sReplaceText = m_pFindDialog->GetReplaceString();
                    RemoveSelectedText();
                    InsertText(sReplaceText);
                    ++replaceCount;
                }
            } while (bFound);
            CUndo::GetInstance().EndGrouping();
            if (replaceCount == 0)
                m_ptSelectionViewPosStart = lastPoint;
            CString message;
            message.Format(IDS_FIND_REPLACED, replaceCount);
            m_pFindDialog->SetStatusText(message, RGB(0, 0, 0));
        }
    }

    return 0;
}

void CBaseView::OnEditFindnextStart()
{
    if (!m_pViewData)
        return;
    if (HasTextSelection())
    {
        m_sFindText    = GetSelectedText();
        m_bMatchCase   = false;
        m_bLimitToDiff = false;
        m_bWholeWord   = false;
        m_sFindText    = m_sFindText.MakeLower();

        BuildFindStringArray();
        OnEditFindnext();
    }
    else
    {
        m_sFindText.Empty();
        BuildFindStringArray();
    }
}

void CBaseView::OnEditFindprevStart()
{
    if (!m_pViewData)
        return;
    if (HasTextSelection())
    {
        m_sFindText    = GetSelectedText();
        m_bMatchCase   = false;
        m_bLimitToDiff = false;
        m_bWholeWord   = false;
        m_sFindText    = m_sFindText.MakeLower();

        BuildFindStringArray();
        OnEditFindprev();
    }
    else
    {
        m_sFindText.Empty();
        BuildFindStringArray();
    }
}

bool CBaseView::StringFound(const CString& str, SearchDirection srchDir, int& start, int& end) const
{
    bool bStringFound;

    do
    {
        if (srchDir == SearchPrevious)
        {
            int lastStart  = -1;
            int lastStart2 = -1;
            do
            {
                lastStart2 = lastStart;
                lastStart  = str.Find(m_sFindText, lastStart + 1);
            } while (lastStart >= 0 && lastStart < start);
            start = lastStart2;
        }
        else
            start = str.Find(m_sFindText, start);
        end          = start + m_sFindText.GetLength();
        bStringFound = (start >= 0);
        if (bStringFound && m_bWholeWord)
        {
            if (start)
                bStringFound = IsWordSeparator(str.Mid(start - 1, 1).GetAt(0));

            if (bStringFound)
            {
                if (str.GetLength() > end)
                    bStringFound = IsWordSeparator(str.Mid(end, 1).GetAt(0));
            }

            if (!bStringFound)
            {
                if (srchDir == SearchPrevious)
                    start--;
                else
                    start = end;
            }
        }
    } while (!bStringFound && start >= 0);

    return bStringFound;
}

void CBaseView::OnEditFindprev()
{
    Search(SearchPrevious, false, true, false);
}

void CBaseView::OnEditFindnext()
{
    Search(SearchNext, false, true, false);
}

bool CBaseView::Search(SearchDirection srchDir, bool useStart, bool flashIfNotFound, bool stopEof)
{
    if (m_sFindText.IsEmpty())
        return false;
    if (!m_pViewData)
        return false;

    POINT start = useStart ? m_ptSelectionViewPosStart : m_ptSelectionViewPosEnd;
    POINT end{};
    end.y = m_pViewData->GetCount() - 1;
    if (end.y < 0)
        return false;

    if (srchDir == SearchNext)
        end.x = GetViewLineLength(end.y);
    else
    {
        end.x   = m_ptSelectionViewPosStart.x;
        start.x = 0;
    }

    if (!HasTextSelection())
    {
        start.y = m_ptCaretViewPos.y;
        if (srchDir == SearchNext)
            start.x = m_ptCaretViewPos.x;
        else
        {
            start.x = 0;
            end.x   = m_ptCaretViewPos.x;
        }
    }
    CString sSelectedText;
    int     startline = -1;
    for (int nViewLine = start.y;; srchDir == SearchNext ? nViewLine++ : nViewLine--)
    {
        if (nViewLine < 0)
        {
            if (stopEof)
                return false;
            nViewLine = m_pViewData->GetCount() - 1;
            startline = start.y;
            if (flashIfNotFound)
            {
                if (m_pFindDialog)
                    m_pFindDialog->SetStatusText(CString(MAKEINTRESOURCE(IDS_FIND_TOPREACHED)), RGB(63, 127, 47));
                m_pMainFrame->FlashWindowEx(FLASHW_ALL, 2, 100);
            }
        }
        if (nViewLine > end.y)
        {
            if (stopEof)
                return false;
            nViewLine = 0;
            startline = start.y;
            if (flashIfNotFound)
            {
                if (m_pFindDialog)
                    m_pFindDialog->SetStatusText(CString(MAKEINTRESOURCE(IDS_FIND_BOTTOMREACHED)), RGB(63, 127, 47));
                m_pMainFrame->FlashWindowEx(FLASHW_ALL, 2, 100);
            }
        }
        switch (m_pViewData->GetState(nViewLine))
        {
            case DIFFSTATE_EMPTY:
                break;
            case DIFFSTATE_UNKNOWN:
            case DIFFSTATE_NORMAL:
            case DIFFSTATE_FILTEREDDIFF:
                if (m_bLimitToDiff)
                    break;
                [[fallthrough]];
            case DIFFSTATE_REMOVED:
            case DIFFSTATE_REMOVEDWHITESPACE:
            case DIFFSTATE_ADDED:
            case DIFFSTATE_ADDEDWHITESPACE:
            case DIFFSTATE_WHITESPACE:
            case DIFFSTATE_WHITESPACE_DIFF:
            case DIFFSTATE_CONFLICTED:
            case DIFFSTATE_CONFLICTED_IGNORED:
            case DIFFSTATE_CONFLICTADDED:
            case DIFFSTATE_CONFLICTEMPTY:
            case DIFFSTATE_CONFLICTRESOLVED:
            case DIFFSTATE_IDENTICALREMOVED:
            case DIFFSTATE_IDENTICALADDED:
            case DIFFSTATE_THEIRSREMOVED:
            case DIFFSTATE_THEIRSADDED:
            case DIFFSTATE_YOURSREMOVED:
            case DIFFSTATE_YOURSADDED:
            case DIFFSTATE_EDITED:
            {
                sSelectedText = GetViewLineChars(nViewLine);
                if (nViewLine == start.y && startline < 0)
                    sSelectedText = srchDir == SearchNext ? sSelectedText.Mid(start.x) : sSelectedText.Left(end.x);
                if (!m_bMatchCase)
                    sSelectedText = sSelectedText.MakeLower();
                int startfound = srchDir == SearchNext ? 0 : sSelectedText.GetLength();
                int endfound   = 0;
                if (StringFound(sSelectedText, srchDir, startfound, endfound))
                {
                    HighlightViewLines(nViewLine, nViewLine);
                    m_ptSelectionViewPosStart.x = startfound;
                    m_ptSelectionViewPosEnd.x   = endfound;
                    if (nViewLine == start.y && startline < 0)
                    {
                        m_ptSelectionViewPosStart.x += start.x;
                        m_ptSelectionViewPosEnd.x += start.x;
                    }
                    m_ptSelectionViewPosEnd.x   = m_ptSelectionViewPosStart.x + m_sFindText.GetLength();
                    m_ptSelectionViewPosStart.y = nViewLine;
                    m_ptSelectionViewPosEnd.y   = nViewLine;
                    m_ptCaretViewPos            = m_ptSelectionViewPosStart;
                    UpdateViewsCaretPosition();
                    EnsureCaretVisible();
                    Invalidate();
                    return true;
                }
            }
            break;
            default:
                break;
        }

        if (startline >= 0)
        {
            if (nViewLine == startline)
            {
                if (flashIfNotFound)
                {
                    CString message;
                    message.Format(IDS_FIND_NOTFOUND, static_cast<LPCWSTR>(m_sFindText));
                    if (m_pFindDialog)
                        m_pFindDialog->SetStatusText(message, RGB(255, 0, 0));
                    ::MessageBeep(0xFFFFFFFF);
                    m_pMainFrame->FlashWindowEx(FLASHW_ALL, 3, 100);
                }
                break;
            }
        }
    }
    m_pMainFrame->m_nMoveMovesToIgnore = MOVESTOIGNORE;
    return false;
}

CString CBaseView::GetSelectedText() const
{
    CString sSelectedText;
    POINT   start = m_ptSelectionViewPosStart;
    POINT   end   = m_ptSelectionViewPosEnd;
    if (!HasTextSelection())
    {
        if (!HasSelection())
            return sSelectedText;
        start.y = m_nSelViewBlockStart;
        start.x = 0;
        end.y   = m_nSelViewBlockEnd;
        end.x   = GetViewLineLength(m_nSelViewBlockEnd);
    }
    if (!m_pViewData)
        return sSelectedText;
    // first store the selected lines in one CString
    for (int nViewLine = start.y; nViewLine <= end.y; nViewLine++)
    {
        switch (m_pViewData->GetState(nViewLine))
        {
            case DIFFSTATE_EMPTY:
                break;
            case DIFFSTATE_UNKNOWN:
            case DIFFSTATE_NORMAL:
            case DIFFSTATE_REMOVED:
            case DIFFSTATE_REMOVEDWHITESPACE:
            case DIFFSTATE_ADDED:
            case DIFFSTATE_ADDEDWHITESPACE:
            case DIFFSTATE_WHITESPACE:
            case DIFFSTATE_WHITESPACE_DIFF:
            case DIFFSTATE_CONFLICTED:
            case DIFFSTATE_CONFLICTED_IGNORED:
            case DIFFSTATE_CONFLICTADDED:
            case DIFFSTATE_CONFLICTEMPTY:
            case DIFFSTATE_CONFLICTRESOLVED:
            case DIFFSTATE_IDENTICALREMOVED:
            case DIFFSTATE_IDENTICALADDED:
            case DIFFSTATE_THEIRSREMOVED:
            case DIFFSTATE_THEIRSADDED:
            case DIFFSTATE_YOURSREMOVED:
            case DIFFSTATE_YOURSADDED:
            case DIFFSTATE_EDITED:
            case DIFFSTATE_FILTEREDDIFF:
                sSelectedText += GetViewLineChars(nViewLine);
                sSelectedText += L"\r\n";
                break;
            default:
                break;
        }
    }
    // remove the non-selected chars from the first line, last line and last \r\n
    int nLeftCut  = start.x;
    int nRightCut = GetViewLineChars(end.y).GetLength() - end.x + 2;
    sSelectedText = sSelectedText.Mid(nLeftCut, sSelectedText.GetLength() - nLeftCut - nRightCut);
    return sSelectedText;
}

void CBaseView::CheckModifications(bool& hasMods, bool& hasConflicts, bool& hasWhitespaceMods, bool& hasFilteredMods) const
{
    hasMods           = false;
    hasConflicts      = false;
    hasWhitespaceMods = false;
    hasFilteredMods   = false;

    if (m_pViewData)
    {
        for (int i = 0; i < m_pViewData->GetCount(); i++)
        {
            DiffStates state = m_pViewData->GetState(i);
            switch (state)
            {
                case DIFFSTATE_ADDED:
                case DIFFSTATE_IDENTICALADDED:
                case DIFFSTATE_THEIRSADDED:
                case DIFFSTATE_YOURSADDED:
                case DIFFSTATE_CONFLICTADDED:
                case DIFFSTATE_IDENTICALREMOVED:
                case DIFFSTATE_REMOVED:
                case DIFFSTATE_THEIRSREMOVED:
                case DIFFSTATE_YOURSREMOVED:
                case DIFFSTATE_EMPTY:
                    hasMods = true;
                    break;
                case DIFFSTATE_CONFLICTED:
                case DIFFSTATE_CONFLICTED_IGNORED:
                    hasConflicts = true;
                    break;
                case DIFFSTATE_REMOVEDWHITESPACE:
                case DIFFSTATE_ADDEDWHITESPACE:
                case DIFFSTATE_WHITESPACE:
                case DIFFSTATE_WHITESPACE_DIFF:
                    hasWhitespaceMods = true;
                    break;
                case DIFFSTATE_FILTEREDDIFF:
                    hasFilteredMods = true;
                    break;
                default:
                    break;
            }
        }
    }
}

void CBaseView::OnEditGotoline()
{
    if (!m_pViewData)
        return;
    // find the last and first line number
    int nViewLineCount = m_pViewData->GetCount();

    int nLastLineNumber = DIFF_EMPTYLINENUMBER;
    for (int nViewLine = nViewLineCount - 1; nViewLine >= 0; --nViewLine)
    {
        nLastLineNumber = m_pViewData->GetLineNumber(nViewLine);
        if (nLastLineNumber != DIFF_EMPTYLINENUMBER)
        {
            break;
        }
    }
    if (nLastLineNumber == DIFF_EMPTYLINENUMBER || nLastLineNumber == 0) // not numbered line foud or last one is first
    {
        return;
    }
    nLastLineNumber++;
    int nFirstLineNumber = 1; // first is always 1

    CString sText;
    sText.Format(IDS_GOTOLINE, nFirstLineNumber, nLastLineNumber);

    CGotoLineDlg dlg(this);
    dlg.SetLabel(sText);
    dlg.SetLimits(nFirstLineNumber, nLastLineNumber);
    if (dlg.DoModal() == IDOK)
    {
        for (int nViewLine = 0; nViewLine < nViewLineCount; ++nViewLine)
        {
            if ((m_pViewData->GetLineNumber(nViewLine) + 1) == dlg.GetLineNumber())
            {
                HighlightViewLines(nViewLine, nViewLine);
                return;
            }
        }
    }
}

int CBaseView::SaveFile(int nFlags)
{
    Invalidate();
    if (m_pViewData && m_pWorkingFile)
    {
        CFileTextLines file;
        m_saveParams.lineEndings = m_lineEndings;
        m_saveParams.unicodeType = m_textType;
        file.SetSaveParams(m_saveParams);

        for (int i = 0; i < m_pViewData->GetCount(); i++)
        {
            //only copy non-removed lines
            DiffStates state = m_pViewData->GetState(i);
            switch (state)
            {
                case DIFFSTATE_CONFLICTED:
                case DIFFSTATE_CONFLICTED_IGNORED:
                {
                    int first = i;
                    int last  = i;
                    do
                    {
                        last++;
                    } while ((last < m_pViewData->GetCount()) && ((m_pViewData->GetState(last) == DIFFSTATE_CONFLICTED) || (m_pViewData->GetState(last) == DIFFSTATE_CONFLICTED_IGNORED)));
                    file.Add(L"<<<<<<< .mine", EOL_NOENDING);
                    for (int j = first; j < last; j++)
                    {
                        file.Add(m_pwndRight->m_pViewData->GetLine(j), m_pwndRight->m_pViewData->GetLineEnding(j));
                    }
                    file.Add(L"=======", EOL_NOENDING);
                    for (int j = first; j < last; j++)
                    {
                        file.Add(m_pwndLeft->m_pViewData->GetLine(j), m_pwndLeft->m_pViewData->GetLineEnding(j));
                    }
                    file.Add(L">>>>>>> .theirs", EOL_NOENDING);
                    i = last - 1;
                }
                break;
                case DIFFSTATE_EMPTY:
                    break;
                case DIFFSTATE_CONFLICTEMPTY:
                case DIFFSTATE_IDENTICALREMOVED:
                case DIFFSTATE_REMOVED:
                case DIFFSTATE_THEIRSREMOVED:
                case DIFFSTATE_YOURSREMOVED:
                case DIFFSTATE_CONFLICTRESOLVEDEMPTY:
                    if ((nFlags & SAVE_REMOVEDLINES) == 0)
                    {
                        // do not save removed lines
                        break;
                    }
                    [[fallthrough]];
                default:
                    file.Add(m_pViewData->GetLine(i), m_pViewData->GetLineEnding(i));
                    break;
            }
        }
        CString filename = m_pWorkingFile->GetFilename();
        if (m_pWorkingFile->IsReadonly())
            if (!CCommonAppUtils::FileOpenSave(filename, nullptr, IDS_SAVEASTITLE, IDS_COMMONFILEFILTER, false, CString(), m_hWnd))
                return -1;
        if (!file.Save(filename))
        {
            ::MessageBox(m_hWnd, file.GetErrorString(), L"TortoiseMerge", MB_ICONERROR);
            return -1;
        }
        m_pWorkingFile->SetFileName(filename);
        m_pWorkingFile->StoreFileAttributes();
        // m_dlgFilePatches.SetFileStatusAsPatched(sFilePath);
        SetModified(FALSE);
        CUndo::GetInstance().MarkAsOriginalState(
            this == m_pwndLeft,
            this == m_pwndRight,
            this == m_pwndBottom);
        if (file.GetCount() == 1 && file.GetAt(0).IsEmpty() && file.GetLineEnding(0) == EOL_NOENDING)
            return 0;
        return file.GetCount();
    }
    return 1;
}

int CBaseView::SaveFileTo(CString sFileName, int nFlags)
{
    if (m_pWorkingFile)
    {
        m_pWorkingFile->SetFileName(sFileName);
        return SaveFile(nFlags);
    }
    return -1;
}

EOL CBaseView::GetLineEndings() const
{
    return GetLineEndings(GetWhitecharsProperties().hasMixedEols);
}

EOL CBaseView::GetLineEndings(bool bHasMixedEols) const
{
    if (bHasMixedEols)
    {
        return EOL_AUTOLINE; // mixed eols - hack value
    }
    if (m_lineEndings == EOL_AUTOLINE)
    {
        return EOL_CRLF;
    }
    return m_lineEndings;
}

void CBaseView::ReplaceLineEndings(EOL eEol)
{
    if (eEol == EOL_AUTOLINE)
    {
        return;
    }
    // set AUTOLINE
    m_lineEndings = eEol;
    // replace all set EOLs
    // TODO store line endings and lineendings in undo
    //CUndo::BeginGrouping();
    for (int i = 0; i < GetViewCount(); ++i)
    {
        if (IsLineEmpty(i))
        {
            continue;
        }
        EOL eLineEol = GetViewLineEnding(i);
        if (eLineEol == EOL_AUTOLINE || eLineEol == EOL_NOENDING || eLineEol == m_lineEndings)
        {
            continue;
        }
        SetViewLineEnding(i, eEol);
    }
    //CUndo::EndGrouping();
    //CUndo::saveundostep;
    DocumentUpdated();
    SetModified();
}

void CBaseView::SetLineEndingStyle(EOL eEol)
{
    m_lineEndings = eEol;
}

void CBaseView::SetTextType(CFileTextLines::UnicodeType eTextType)
{
    if (m_textType == eTextType)
    {
        return;
    }
    m_textType = eTextType;
    DocumentUpdated();
    SetModified();
}

void CBaseView::AskUserForNewLineEndingsAndTextType(int nTextId)
{
    if (IsReadonly())
        return; // nothing to be changed in read-only view
    CEncodingDlg dlg;
    dlg.view        = CString(MAKEINTRESOURCE(nTextId));
    dlg.texttype    = m_textType;
    dlg.m_lineEndings = GetLineEndings();
    if (dlg.DoModal() != IDOK)
        return;
    SetTextType(dlg.texttype);
    ReplaceLineEndings(dlg.m_lineEndings);
}

/**
    Replaces lines from source view to this
*/
void CBaseView::UseViewBlock(CBaseView* pwndView, int nFirstViewLine, int nLastViewLine, std::function<bool(int)> fnSkip)
{
    if (!IsViewGood(pwndView))
        return;
    if (!IsWritable())
        return;
    CUndo::GetInstance().BeginGrouping();

    for (int viewLine = nFirstViewLine; viewLine <= nLastViewLine; viewLine++)
    {
        bool skip = fnSkip(viewLine);
        if (skip)
        {
            if (GetViewMarked(viewLine))
                SetViewMarked(viewLine, false);
            continue;
        }
        ViewData line = pwndView->GetViewData(viewLine);
        if (line.ending != EOL_NOENDING)
            line.ending = m_lineEndings;
        switch (line.state)
        {
            case DIFFSTATE_CONFLICTEMPTY:
            case DIFFSTATE_UNKNOWN:
                line.state = DIFFSTATE_EMPTY;
                [[fallthrough]];
            case DIFFSTATE_EMPTY:
                break;
            case DIFFSTATE_ADDED:
            case DIFFSTATE_CONFLICTADDED:
            case DIFFSTATE_CONFLICTED:
            case DIFFSTATE_CONFLICTED_IGNORED:
            case DIFFSTATE_IDENTICALADDED:
            case DIFFSTATE_THEIRSADDED:
            case DIFFSTATE_YOURSADDED:
            case DIFFSTATE_IDENTICALREMOVED:
            case DIFFSTATE_REMOVED:
            case DIFFSTATE_THEIRSREMOVED:
            case DIFFSTATE_YOURSREMOVED:
                pwndView->SetViewState(viewLine, DIFFSTATE_NORMAL);
                line.state = DIFFSTATE_NORMAL;
                [[fallthrough]];
            case DIFFSTATE_NORMAL:
                break;
            default:
                break;
        }
        bool marked = GetViewMarked(viewLine);
        SetViewData(viewLine, line);
        if (marked)
            SetViewMarked(viewLine, false);
        if ((m_textType == UnicodeType::ASCII) && (pwndView->GetTextType() != UnicodeType::ASCII))
        {
            // if this view is in ASCII and the other is not, we have to make sure that
            // the text we copy from the other view can actually be saved in ASCII encoding.
            // if not, we have to change this views encoding to the same encoding as the other view
            BOOL useDefault = FALSE;
            WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, line.sLine, -1, nullptr, 0, nullptr, &useDefault);
            if (useDefault) // a default char is required, so the char can not be saved as ASCII
                SetTextType(pwndView->GetTextType());
        }
    }
    // normal lines is mostly same but may differ in EOL so any copied line change view state to modified
    // TODO: check if copied line is same as original one set modified only when differ
    SetModified();
    SaveUndoStep();

    int nRemovedLines = CleanEmptyLines();
    SaveUndoStep();
    //VerifyEols();
    // make sure all non empty line have EOL set but last
    // wrong can be last copied line(have eol, but no line under),
    // or old last line (line before copied block missing eol, but have line under)
    // we'll check all lines to be sure
    int nLine = GetViewCount();
    // check last line have no EOL set
    while (--nLine >= 0)
    {
        if (!IsViewLineEmpty(nLine))
        {
            if (GetViewLineEnding(nLine) != EOL_NOENDING)
            {
                // we added non last line into empty block on the end (or should we remove eol from this one ?)
                // so next line is empty
                ASSERT(IsViewLineEmpty(nLine + 1));
                // and we can turn it to normal empty line
                SetViewData(nLine + 1, ViewData(CString(), DIFFSTATE_ADDED, 1, EOL_NOENDING, HIDESTATE_SHOWN));
            }
            break;
        }
    }
    // check all (nonlast) line have EOL set
    while (--nLine >= 0)
    {
        if (!IsViewLineEmpty(nLine))
        {
            if (GetViewLineEnding(nLine) == EOL_NOENDING)
            {
                SetViewLineEnding(nLine, m_lineEndings);
                // in theory there should be only one line needing fix, but most of time we get over all anyway
                // break;
            }
        }
    }
    SaveUndoStep();
    UpdateViewLineNumbers();
    SaveUndoStep();

    CUndo::GetInstance().EndGrouping();

    if (nRemovedLines != 0)
    {
        // some lines are gone update selection
        ClearSelection();
        SetupAllViewSelection(nFirstViewLine, nLastViewLine - nRemovedLines);
    }
    BuildAllScreen2ViewVector();
    pwndView->Invalidate();
    RefreshViews();
}

void CBaseView::MarkBlock(bool marked, int nFirstViewLine, int nLastViewLine)
{
    if (!IsWritable())
        return;
    CUndo::GetInstance().BeginGrouping();

    for (int viewLine = nFirstViewLine; viewLine <= nLastViewLine; viewLine++)
        SetViewMarked(viewLine, marked);

    SetModified();
    SaveUndoStep();
    CUndo::GetInstance().EndGrouping();

    BuildAllScreen2ViewVector();
    Invalidate();
    RefreshViews();
}

void CBaseView::LeaveOnlyMarkedBlocks(CBaseView* pwndView)
{
    auto fn = [this](int viewLine) -> bool { return GetViewMarked(viewLine) || GetViewState(viewLine) == DIFFSTATE_EDITED; };
    UseViewBlock(pwndView, 0, GetViewCount() - 1, fn);
}

void CBaseView::UseViewFileOfMarked(CBaseView* pwndView)
{
    auto fn = [this](int viewLine) -> bool { return !GetViewMarked(viewLine) || GetViewState(viewLine) == DIFFSTATE_EDITED; };
    UseViewBlock(pwndView, 0, GetViewCount() - 1, fn);
}

void CBaseView::UseViewFileExceptEdited(CBaseView* pwndView)
{
    auto fn = [this](int viewLine) -> bool { return GetViewState(viewLine) == DIFFSTATE_EDITED; };
    UseViewBlock(pwndView, 0, GetViewCount() - 1, fn);
}

int CBaseView::GetLargestSpaceStreak(const CString& line) const
{
    int count     = 0;
    int maxstreak = 0;
    for (int i = 0; i < line.GetLength(); ++i)
    {
        if (line[i] == ' ')
            ++count;
        else
        {
            maxstreak = std::max(count, maxstreak);
            count     = 0;
        }
    }
    return std::max(count, maxstreak);
}

int CBaseView::GetIndentCharsForLine(int x, int y)
{
    const int      maxGuessLine = 100;
    int            nTabMode     = -1;
    const CString& line         = GetViewLine(y);
    if (m_nTabMode & TABMODE_SMARTINDENT)
    {
        // if the line contains one tab, use tabs
        // we can not test for spaces, since even if tabs are used,
        // spaces are used in a tabified file for alignment.
        if (line.Find('\t') >= 0)
            nTabMode = 0; // use tabs
        else if (GetLargestSpaceStreak(line) > m_nTabSize)
            nTabMode = 1; // use spaces

        // detect lines nearby
        for (int i = y - 1, j = y + 1; nTabMode == -1; --i, ++j)
        {
            bool above = i >= 0 && i >= y - maxGuessLine;
            bool below = j < GetViewCount() && j <= y + maxGuessLine;
            if (!(above || below))
                break;
            auto ac = CString();
            auto bc = CString();
            if (above)
                ac = GetViewLine(i);
            if (below)
                bc = GetViewLine(j);
            if ((ac.Find('\t') >= 0) || (bc.Find('\t') >= 0))
            {
                nTabMode = 0;
                break;
            }
            else if ((GetLargestSpaceStreak(ac) > m_nTabSize) && (GetLargestSpaceStreak(bc) > m_nTabSize))
            {
                nTabMode = 1;
                break;
            }
        }
    }
    else
        nTabMode = m_nTabMode & TABMODE_USESPACES;

    if (nTabMode > 0)
    {
        // use spaces
        x = CountExpandedChars(line, x);
        return (m_nTabSize - (x % m_nTabSize));
    }

    // use tab
    return 0;
}

void CBaseView::AddIndentationForSelectedBlock()
{
    bool bModified = false;
    for (int nViewLine = m_ptSelectionViewPosStart.y; nViewLine <= m_ptSelectionViewPosEnd.y; nViewLine++)
    {
        // skip the line if no character is selected in the last selected line
        if (nViewLine == m_ptSelectionViewPosEnd.y && m_ptSelectionViewPosEnd.x == 0)
        {
            continue;
        }
        // skip empty lines
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        const CString& sLine = GetViewLine(nViewLine);
        CString        sTemp = sLine;
        if (sTemp.Trim().IsEmpty())
        {
            // skip empty and whitechar only lines
            continue;
        }
        // add tab to line start (alternatively m_nTabSize spaces can be used)
        CString tabStr;
        int     indentChars = GetIndentCharsForLine(0, nViewLine);
        tabStr              = indentChars > 0 ? CString(' ', indentChars) : CString(L"\t");
        SetViewLine(nViewLine, tabStr + sLine);
        bModified = true;
    }
    if (bModified)
    {
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector();
    }
}

void CBaseView::RemoveIndentationForSelectedBlock()
{
    bool bModified = false;
    for (int nViewLine = m_ptSelectionViewPosStart.y; nViewLine <= m_ptSelectionViewPosEnd.y; nViewLine++)
    {
        // skip the line if no character is selected in the last selected line
        if (nViewLine == m_ptSelectionViewPosEnd.y && m_ptSelectionViewPosEnd.x == 0)
        {
            continue;
        }
        // skip empty lines
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        CString sLine = GetViewLine(nViewLine);
        // remove up to n spaces from line start
        // and one tab (if less then n spaces was removed)
        int nPos = 0;
        while (nPos < m_nTabSize)
        {
            switch (sLine[nPos])
            {
                case ' ':
                    nPos++;
                    continue;
                case '\t':
                    nPos++;
            }
            break;
        }
        if (nPos > 0)
        {
            sLine.Delete(0, nPos);
            SetViewLine(nViewLine, sLine);
            bModified = true;
        }
    }
    if (bModified)
    {
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector();
    }
}

/**
    there are two possible versions
     - convert tabs to spaces only in front of text (implemented)
     - convert all tabs to spaces
*/
void CBaseView::ConvertTabToSpaces()
{
    bool bModified = false;
    for (int nViewLine = 0; nViewLine < GetViewCount(); nViewLine++)
    {
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        const CString& sLine              = GetViewLine(nViewLine);
        bool           bTabToConvertFound = false;
        int            nPosIn             = 0;
        int            nPosOut            = 0;
        while (nPosIn < sLine.GetLength())
        {
            switch (sLine[nPosIn])
            {
                case ' ':
                    nPosIn++;
                    nPosOut++;
                    continue;
                case '\t':
                    nPosIn++;
                    bTabToConvertFound = true;
                    nPosOut            = (nPosOut + m_nTabSize) - nPosOut % m_nTabSize;
                    continue;
            }
            break;
        }
        if (bTabToConvertFound)
        {
            CString sLineNew = sLine;
            sLineNew.Delete(0, nPosIn);
            sLineNew = CString(' ', nPosOut) + sLineNew;
            SetViewLine(nViewLine, sLineNew);
            bModified = true;
        }
    }
    if (bModified)
    {
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector();
    }
}

/**
    there are two possible versions
     - convert spaces to tabs only in front of text (implemented)
     - convert all spaces to tabs
*/
void CBaseView::Tabularize()
{
    bool bModified = false;
    for (int nViewLine = 0; nViewLine < GetViewCount(); nViewLine++)
    {
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        const CString& sLine       = GetViewLine(nViewLine);
        int            nDel        = 0;
        int            nTabCount   = 0; // total tabs to be used
        int            nSpaceCount = 0; // number of spaces in tab size run
        int            nPos        = 0;
        while (nPos < sLine.GetLength())
        {
            switch (sLine[nPos++])
            {
                case ' ':
                    //bSpace = true;
                    if (++nSpaceCount < m_nTabSize)
                    {
                        continue;
                    }
                    [[fallthrough]];
                case '\t':
                    nTabCount++;
                    nSpaceCount = 0;
                    nDel        = nPos;
                    continue;
            }
            break;
        }
        if (nDel > 0)
        {
            CString sLineNew = sLine;
            sLineNew.Delete(0, nDel);
            sLineNew = CString('\t', nTabCount) + sLineNew;
            if (sLine != sLineNew)
            {
                SetViewLine(nViewLine, sLineNew);
                bModified = true;
            }
        }
    }
    if (bModified)
    {
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector();
    }
}

void CBaseView::RemoveTrailWhiteChars()
{
    bool bModified = false;
    for (int nViewLine = 0; nViewLine < GetViewCount(); nViewLine++)
    {
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        const CString& sLine    = GetViewLine(nViewLine);
        CString        sLineNew = sLine;
        sLineNew.TrimRight();
        if (sLine.GetLength() != sLineNew.GetLength())
        {
            SetViewLine(nViewLine, sLineNew);
            bModified = true;
        }
    }
    if (bModified)
    {
        SetModified();
        SaveUndoStep();
        BuildAllScreen2ViewVector();
    }
}

CBaseView::TWhitecharsProperties CBaseView::GetWhitecharsProperties() const
{
    if (GetViewCount() > 10000)
    {
        // 10k lines is enough to check
        TWhitecharsProperties oRet = {true, true, true, true};
        return oRet;
    }
    TWhitecharsProperties oRet = {};
    for (int nViewLine = 0; nViewLine < GetViewCount(); nViewLine++)
    {
        if (IsLineEmpty(nViewLine))
        {
            continue;
        }
        const CString& sLine = GetViewLine(nViewLine);
        if (sLine.IsEmpty())
        {
            continue;
        }
        // check leading whites for convertible tabs and spaces
        int nPos        = 0;
        int nSpaceCount = 0; // number of spaces in tab size run
        while (nPos < sLine.GetLength() && (!oRet.hasSpacesToConvert || !oRet.hasTabsToConvert))
        {
            switch (sLine[nPos++])
            {
                case ' ':
                    if (++nSpaceCount >= m_nTabSize)
                    {
                        oRet.hasSpacesToConvert = true;
                    }
                    continue;
                case '\t':
                    oRet.hasTabsToConvert = true;
                    if (nSpaceCount != 0)
                    {
                        oRet.hasSpacesToConvert = true;
                    }
                    continue;
            }
            break;
        }

        // check trailing whites for removable chars
        switch (sLine[sLine.GetLength() - 1])
        {
            case ' ':
            case '\t':
                oRet.hasTrailWhiteChars = true;
        }

        // check EOLs
        EOL eLineEol = GetViewLineEnding(nViewLine);
        if (!oRet.hasMixedEols && (eLineEol != m_lineEndings) && (eLineEol != EOL_AUTOLINE) && (eLineEol != EOL_NOENDING))
        {
            oRet.hasMixedEols = true;
        }
    }
    return oRet;
}

void CBaseView::InsertText(const CString& sText)
{
    ResetUndoStep();

    POINT ptCaretViewPos = GetCaretViewPosition();
    int   nLeft          = ptCaretViewPos.x;
    int   nViewLine      = ptCaretViewPos.y;

    if ((nViewLine == 0) && (GetViewCount() == 0))
        OnChar(VK_RETURN, 0, 0);

    std::vector<CString> lines;
    int                  nStart  = 0;
    int                  nEolPos = 0;
    while ((nEolPos = sText.Find('\r', nEolPos)) >= 0)
    {
        CString sLine = sText.Mid(nStart, nEolPos - nStart);
        lines.push_back(sLine);
        nEolPos++;
        nStart = nEolPos;
    }
    CString sLine = sText.Mid(nStart);
    lines.push_back(sLine);

    int nLinesToPaste = static_cast<int>(lines.size());
    if (nLinesToPaste > 1)
    {
        // multiline text

        // We want to undo the multiline insertion in a single step.
        CUndo::GetInstance().BeginGrouping();

        sLine                    = GetViewLineChars(nViewLine);
        CString  sLineLeft       = sLine.Left(nLeft);
        CString  sLineRight      = sLine.Right(sLine.GetLength() - nLeft);
        EOL      eOriginalEnding = GetViewLineEnding(nViewLine);
        ViewData newLine(L"", DIFFSTATE_EDITED, 1, m_lineEndings, HIDESTATE_SHOWN);
        if (!lines[0].IsEmpty() || !sLineRight.IsEmpty() || (eOriginalEnding != m_lineEndings))
        {
            newLine.sLine = sLineLeft + lines[0];
            SetViewData(nViewLine, newLine);
        }

        int nInsertLine = nViewLine;
        for (int i = 1; i < nLinesToPaste - 1; i++)
        {
            newLine.sLine = lines[i];
            InsertViewData(++nInsertLine, newLine);
        }
        newLine.sLine  = lines[nLinesToPaste - 1LL] + sLineRight;
        newLine.ending = eOriginalEnding;
        InsertViewData(++nInsertLine, newLine);

        SetModified();
        SaveUndoStep();

        // adds new lines everywhere except me
        if (IsViewGood(m_pwndLeft) && m_pwndLeft != this)
        {
            m_pwndLeft->InsertViewEmptyLines(nViewLine + 1, nLinesToPaste - 1);
        }
        if (IsViewGood(m_pwndRight) && m_pwndRight != this)
        {
            m_pwndRight->InsertViewEmptyLines(nViewLine + 1, nLinesToPaste - 1);
        }
        if (IsViewGood(m_pwndBottom) && m_pwndBottom != this)
        {
            m_pwndBottom->InsertViewEmptyLines(nViewLine + 1, nLinesToPaste - 1);
        }
        UpdateViewLineNumbers();
        SaveUndoStep();

        CUndo::GetInstance().EndGrouping();

        ptCaretViewPos = SetupPoint(lines[nLinesToPaste - 1LL].GetLength(), nInsertLine);
    }
    else
    {
        // single line text - just insert it
        sLine = GetViewLineChars(nViewLine);
        sLine.Insert(nLeft, sText);
        ptCaretViewPos = SetupPoint(nLeft + sText.GetLength(), nViewLine);
        SetViewLine(nViewLine, sLine);

        auto viewState = GetViewState(nViewLine);
        if (IsStateEmpty(viewState) || IsStateConflicted(viewState) || viewState == DIFFSTATE_IDENTICALREMOVED)
        {
            // if not last line set EOL
            for (int nCheckViewLine = nViewLine + 1; nCheckViewLine < GetViewCount(); ++nCheckViewLine)
            {
                if (!IsViewLineEmpty(nCheckViewLine))
                {
                    SetViewLineEnding(nViewLine, m_lineEndings);
                    break;
                }
            }
            // make sure previous (non empty) line have EOL set
            for (int nCheckViewLine = nViewLine - 1; nCheckViewLine > 0; --nCheckViewLine)
            {
                if (!IsViewLineEmpty(nCheckViewLine))
                {
                    if (GetViewLineEnding(nCheckViewLine) == EOL_NOENDING)
                        SetViewLineEnding(nCheckViewLine, m_lineEndings);
                    break;
                }
            }
        }

        SetViewState(nViewLine, DIFFSTATE_EDITED);
        SetModified();
        SaveUndoStep();
    }

    RefreshViews();
    BuildAllScreen2ViewVector();
    UpdateCaretViewPosition(ptCaretViewPos);
}