add empty qml demo

Yuhang Zhao

2023-12-11 e9ce49b601b412050e9709a3474e51950dccd5a9

 src/core/contexts/qtwindowcontext_p.h

@@ -11,11 +11,9 @@
        QtWindowContext();
        ~QtWindowContext();

    public:
        bool setup(QObject *host, WindowItemDelegate *delegate) override;

    protected:
        bool eventFilter(QObject *obj, QEvent *event) override;
        bool setupHost() override;
        bool hostEventFilter(QEvent *event) override;
    };

}