QTabBar is clipped while being moved

When one sets the property movable of a QTabBar or a QTabWidget to true, the tab can be clipped, while it is being moved. More precisely, it is being clipped when it is moved outside of the original TabBar-boundary. This doesn't look very nice, and should be corrected.
Attached is a small example, which demonstrates this effect. Either move the tab from the QTabWidget (upper Tab) or the one from a QTabBar (lower Tab) with the mouse a relatively large distance and it will be clipped and further away it will even disappear.