Partially finish the bug after window close and reshow

Sine Striker

2024-02-20 2d2fc799bc698ebf7e7c8bcc394366d0d7bf071b

 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);