[PyQt] Possible bug with QtCore.QPropertyAnimation and QAxContainer.QAxWidget

[Itay Brandes]

There is a possible bug when trying to use *QAxContainer.QAxWidget*, *
QtGui.QGraphicsOpacityEffect* and *QtCore.QPropertyAnimation* in the same
application.

This happens when trying to animate a widget's opacity (creating a "fade
out" effect).
The animation won't update correctly if a QAxWidget is present somewhere in
the same window.
The bug can be seen here:
http://itayb.hostzi.com/eventloop_doesnt_update.avi

A test case that causes the weird behavior is attached.

Thanks!
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