Fix window visibility inconsistency

Sine Striker

2023-12-26 1740ed5e0e765ebd8676733243eb3eaa81f95df1

 src/widgets/widgetwindowagent_p.h

@@ -34,6 +34,7 @@

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