fix window reopen issue (#179)

Yuhang Zhao

2025-05-09 e9999fa61ea0ffa602c69e10e54996b3a636a5e6

 examples/mainwindow/mainwindow.h

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

    void closeEvent(QCloseEvent *event) override;

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