allow qml demo choose special effect

Yuhang Zhao

2023-12-28 68c8cc026233e9694579ce38b8daa25008477d18

 src/core/contexts/win32windowcontext_p.h

@@ -69,7 +69,7 @@
        // WM_MOUSELEAVE.
        bool mouseLeaveBlocked = false;

        bool centered = false;
        bool initialCentered = false;
    };

}