How can I toggle 'StaysOnTop'

[dr_kw]

I want to toggle StaysOnTop, and I wrote like above on Qt 5.3 MSVC2012 32bit Windows
@
void MainWindow::on_testButton_clicked()
{
setWindowFlags(windowFlags() ^ Qt::WindowStaysOnTopHint);
qDebug() << windowFlags();
show();
}
@

First click makes window always on top.
But next click doesn't make disabled always on top.
Is this a normal operation?
And how can I toggle always on top?

[dvb0222]

Duplicate of

http://qt-project.org/forums/viewthread/31769

[dvb0222]

Note: I reproduced this on Windows 7 but on Linux works as expected.