Fix hasSelection wrongly detected

Fix #14322, close #14330

PowerEditor/src/Notepad_plus.cpp

@@ -2555,7 +2555,7 @@ void Notepad_plus::enableCommand(int cmdID, bool doEnable, int which) const
 
 void Notepad_plus::checkClipboard()
 {
-	bool hasSelection = (_pEditView->execute(SCI_GETSELECTIONSTART) != _pEditView->execute(SCI_GETSELECTIONEND));
+	bool hasSelection = _pEditView->hasSelection();
 	bool canPaste = (_pEditView->execute(SCI_CANPASTE) != 0);
 	enableCommand(IDM_EDIT_CUT, hasSelection, MENU | TOOLBAR);
 	enableCommand(IDM_EDIT_COPY, hasSelection, MENU | TOOLBAR);

PowerEditor/src/NppCommands.cpp

@@ -2012,6 +2012,9 @@ void Notepad_plus::command(int id)
 				(id == IDM_EDIT_MULTISELECTALLMATCHCASE ? SCFIND_MATCHCASE :
 					(id == IDM_EDIT_MULTISELECTALLWHOLEWORD ? SCFIND_WHOLEWORD: SCFIND_MATCHCASE| SCFIND_WHOLEWORD));
 
+			// Don't use _pEditView->hasSelection() because when multi-selection is active and main selection has no selection,
+			// it will cause an infinite loop on SCI_MULTIPLESELECTADDEACH. See:
+			// https://github.com/notepad-plus-plus/notepad-plus-plus/pull/14330#issuecomment-1797080251
 			bool hasSelection = (_pEditView->execute(SCI_GETSELECTIONSTART) != _pEditView->execute(SCI_GETSELECTIONEND));
 			if (!hasSelection)
 				_pEditView->expandWordSelection();

PowerEditor/src/ScintillaComponent/ScintillaEditView.cpp

@@ -544,8 +544,7 @@ LRESULT ScintillaEditView::scintillaNew_Proc(HWND hwnd, UINT Message, WPARAM wPa
 						SHORT shift = GetKeyState(VK_SHIFT);
 						if ((shift & 0x8000) && !(ctrl & 0x8000) && !(alt & 0x8000))
 						{
-							bool hasSelection = (execute(SCI_GETSELECTIONSTART) != execute(SCI_GETSELECTIONEND));
-							if (!hasSelection)
+							if (!hasSelection())
 							{
 								execute(SCI_LINEDELETE);
 								return TRUE;
@@ -562,8 +561,7 @@ LRESULT ScintillaEditView::scintillaNew_Proc(HWND hwnd, UINT Message, WPARAM wPa
 						SHORT shift = GetKeyState(VK_SHIFT);
 						if ((ctrl & 0x8000) && !(alt & 0x8000) && !(shift & 0x8000))
 						{
-							bool hasSelection = (execute(SCI_GETSELECTIONSTART) != execute(SCI_GETSELECTIONEND));
-							if (!hasSelection)
+							if (!hasSelection())
 							{
 								execute(wParam == 'C' ? SCI_LINECOPY : SCI_LINECUT);
 								//return TRUE;

PowerEditor/src/ScintillaComponent/ScintillaEditView.h

@@ -717,6 +717,8 @@ public:
 	void notifyMarkers(Buffer * buf, bool isHide, size_t location, bool del);
 	void runMarkers(bool doHide, size_t searchStart, bool endOfDoc, bool doDelete);
 
+	bool hasSelection() const { return !execute(SCI_GETSELECTIONEMPTY); };
+
 	bool isSelecting() const {
 		static Sci_CharacterRangeFull previousSelRange = getSelection();
 		Sci_CharacterRangeFull currentSelRange = getSelection();