Disallow Goto dlg offset option from moving to position inside multibyte char or between CR and LF

Fix #9101, fix #9125, close #9129

PowerEditor/src/ScitillaComponent/GoToLineDlg.cpp

@@ -62,9 +62,17 @@ INT_PTR CALLBACK GoToLineDlg::run_dlgProc(UINT message, WPARAM wParam, LPARAM)
 						}
 						else
 						{
-							auto sci_line = (*_ppEditView)->execute(SCI_LINEFROMPOSITION, line);
+							int posToGoto = 0;
+							if (line > 0)
+							{
+								// make sure not jumping into the middle of a multibyte character
+								// or into the middle of a CR/LF pair for Windows files
+								auto before = (*_ppEditView)->execute(SCI_POSITIONBEFORE, line);
+								posToGoto = static_cast<int>((*_ppEditView)->execute(SCI_POSITIONAFTER, before));
+							}
+							auto sci_line = (*_ppEditView)->execute(SCI_LINEFROMPOSITION, posToGoto);
 							(*_ppEditView)->execute(SCI_ENSUREVISIBLE, sci_line);
-							(*_ppEditView)->execute(SCI_GOTOPOS, line);
+							(*_ppEditView)->execute(SCI_GOTOPOS, posToGoto);
 						}
 					}