border can't resize when framelesswindows in a parent widget.

[Charist]

when the framelesswindows is used in a parent widget. in a MainWindow.cpp , the MainWindow construction funcition like:

    QWidget* m_widget1 = new FramelessWindow(this);
    m_widget1->resize(200, 200);
    m_widget1->show();

the framelesswindows can't reszie anymore.