QGraphicsView mouseDoubleClickEvent never accepts the event

By looking at the code of QGraphicsView in 4.5.3, it can clearly be seen that QGraphicsView translates the QMouseEvent to QGraphicsSceneMouseEvent and sends it to the scene but never sets the accepted flag of the original QMouseEvent accordingly.

It also seems that QGraphicsSceneMouseEvent::setButtons is called twice consecutively in the event conversion process.