[Development] Unset QGraphicsView handScrolling when drag mode is reset

[Kernc]

Hi,

Trying to exploit the built-in Qt functionality regarding drag modes
(rubber-band, scroll-hand) and associated behavior in QGraphicsView, I
found a single line in QGraphicsView.setDragMode() that prevented my
beautiful and intuitive implementation to work and which I believe may
have been a bug.

Please find attached a patch and more information within.

Thanks.
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