If you force-show a widget (e.g. `w.setVisible(True)`) before parenting it, a small window will flash (appear and disappear) for a fraction of second, which is a bit irritating.
If you force-show a widget (e.g. `w.setVisible(True)`) before parenting it, a small window will flash (appear and disappear) for a fraction of second, which is a bit irritating.