add qt impl

Zhao Yuhang

2023-12-15 dddf96c011723a12b11acc2980c10eb370961021

 src/widgets/widgetwindowagent_cocoa.cpp

@@ -77,8 +77,10 @@
                }
                break;
            }
            default:
                break;
            default: {
                Q_UNREACHABLE();
                return false;
            }
        }
        return false;
    }