add empty qml demo

Yuhang Zhao

2023-12-11 e9ce49b601b412050e9709a3474e51950dccd5a9

 src/core/contexts/abstractwindowcontext.cpp

@@ -50,7 +50,7 @@
        // Install specific event filter
        host->installEventFilter(new EventFilterForwarder(
            [](QEvent *event, void *user) {
                return reinterpret_cast<AbstractWindowContext *>(user)->hostEventFilter(event);
                return static_cast<AbstractWindowContext *>(user)->hostEventFilter(event);
            },
            this, this));