Add notification observer on Mac

SineStriker

2023-12-27 88b5b56b6a67d93208eae3980af2f30da09dd8ae

 src/widgets/widgetwindowagent_p.h

@@ -32,7 +32,7 @@
        std::unique_ptr<QObject> systemButtonAreaWidgetEventFilter;
#endif

#if defined(Q_OS_WINDOWS) && QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
#if defined(Q_OS_WINDOWS) && QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDERS)
        void setupWindows10BorderWorkaround();
        std::unique_ptr<QObject> borderHandler;
#endif