move window to center before show

Yuhang Zhao

2023-12-06 dfc3457cabeb57be46228816127ee32abf609853

 examples/mainwindow/mainwindow.h

@@ -7,6 +7,9 @@
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

protected:
    void installWindowAgent();
};

#endif // MAINWINDOW_H