[PyQt] Object ownership bug in QGraphicsScene::setStyle()

[Max Schwarz]

Hi,

I think I have discovered a bug in PyQt.

QGraphicsScene.setStyle() does not move ownership of the style to C++, but Qt 
reparents the style to the scene and deletes it at exit, which causes a 
segmentation fault if the python interpreter tries to delete it as well.

See the attachment for a minimal sample.

I believe line 314 of sip/qgraphicsscene.sip is to blame:

%If (Qt_4_4_0 -)
    void setStyle(QStyle *);
%End

I did not delve deeply into sip, but I think a /Transfer/ annotation is 
missing.

My PyQt4 version: 4.7.3-1ubuntu2~lucid1~ppa2 from the kubuntu beta ppa, I did 
not check if the issue still remains with more current versions.

Max
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