Optimize system button area APIs

SineStriker

2023-12-29 76924a335f40a0c3cc13805b4cb9429c336d33ca

 src/quick/quickwindowagent.cpp

@@ -59,6 +59,9 @@
        if (!d->context->setTitleBar(item)) {
            return;
        }
#ifdef Q_OS_MAC
        setSystemButtonArea(nullptr);
#endif
        Q_EMIT titleBarWidgetChanged(item);
    }