Fix quick initialization failure

Sine Striker

2024-02-25 6f6f96909e7ded6ae3a4e59d9d4b62fa593abb23

 examples/mainwindow/mainwindow.h

@@ -30,6 +30,8 @@
protected:
    bool event(QEvent *event) override;

    void closeEvent(QCloseEvent *event) override;

private:
    void installWindowAgent();
    void loadStyleSheet(Theme theme);