[BUG_FIXED] Fix bug that backup is not performed while view is switched from one to another.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1237 f5eea248-9336-0410-98b8-ebc06183d4e3

PowerEditor/src/Notepad_plus.cpp

@@ -3057,6 +3057,9 @@ int Notepad_plus::switchEditViewTo(int gid)
 		_pDocMap->initWrapMap();
 	}
 
+	// Before switching off, synchronize backup file
+	MainFileManager->backupCurrentBuffer();
+
 	notifyBufferActivated(_pEditView->getCurrentBufferID(), currentView());
 	return oldView;
 }