Prevent convert line endings for large file.

src/Edit.cpp

@@ -4365,22 +4365,25 @@ void EditEnsureSelectionVisible() noexcept {
 }
 
 void EditEnsureConsistentLineEndings() noexcept {
+	const size_t lineCount = SciCall_GetLineCount();
+	const size_t actions = SciCall_GetUndoActions();
+	if (lineCount + actions >= static_cast<size_t>(INT_MAX)) {
+		// Scintilla undo stack is indexed with int
+		return;
+	}
+
 	const int iEOLMode = SciCall_GetEOLMode();
 	if (iEOLMode == SC_EOL_CRLF) {
 #if defined(_WIN64)
 		const int options = SciCall_GetDocumentOptions();
-		if (!(options & SC_DOCUMENTOPTION_TEXT_LARGE)) {
-			const Sci_Position dwLength = SciCall_GetLength() + SciCall_GetLineCount();
-			if (dwLength >= INT_MAX) {
+		if (!(options & SC_DOCUMENTOPTION_TEXT_LARGE))
+#endif
+		{
+			const size_t dwLength = SciCall_GetLength() + lineCount;
+			if (dwLength >= static_cast<size_t>(INT_MAX)) {
 				return;
 			}
 		}
-#else
-		const DWORD dwLength = static_cast<DWORD>(SciCall_GetLength()) + static_cast<DWORD>(SciCall_GetLineCount());
-		if (dwLength >= INT_MAX) {
-			return;
-		}
-#endif
 	}
 
 	SciCall_ConvertEOLs(iEOLMode);

src/Notepad4.cpp

@@ -5063,8 +5063,8 @@ LRESULT MsgNotify(HWND hwnd, WPARAM wParam, LPARAM lParam) {
 
 			case StatusItem_EolMode: {
 				constexpr UINT mask = (SC_EOL_LF << 2*SC_EOL_CRLF) | (SC_EOL_CR << 2*SC_EOL_LF) | (SC_EOL_CRLF << 2*SC_EOL_CR);
-				iCurrentEOLMode = (mask >> (iCurrentEOLMode << 1)) & 3;
-				ConvertLineEndings(iCurrentEOLMode);
+				const int iNewEOLMode = (mask >> (iCurrentEOLMode << 1)) & 3;
+				ConvertLineEndings(iNewEOLMode);
 				return TRUE;
 			}
 

src/SciCall.h

@@ -260,8 +260,8 @@ inline void SciCall_EndUndoAction() noexcept {
 	SciCall(SCI_ENDUNDOACTION, 0, 0);
 }
 
-inline int SciCall_GetUndoActions() noexcept {
-	return static_cast<int>(SciCall(SCI_GETUNDOACTIONS, 0, 0));
+inline size_t SciCall_GetUndoActions() noexcept {
+	return SciCall(SCI_GETUNDOACTIONS, 0, 0);
 }
 
 inline void SciCall_SetChangeHistory(int changeHistory) noexcept {