switch (cmd.action) {
case LFUN_UNDO:
- flag.enabled(!buffer_.undo().hasUndoStack());
+ flag.enabled(buffer_.undo().hasUndoStack());
break;
case LFUN_REDO:
- flag.enabled(!buffer_.undo().hasRedoStack());
+ flag.enabled(buffer_.undo().hasRedoStack());
break;
case LFUN_FILE_INSERT:
case LFUN_FILE_INSERT_PLAINTEXT_PARA: