Qt5 regression: QGestureEvent isn't delivered anymore.(On a Mac, using a trackpad)

I have a QGraphicsView and call grabGesture(Qt::PinchGesture) in the constructor, but "bool event(QEvent *e)" is never called with "(e->type() == QEvent::Gesture)".

Code can be found at https://bitbucket.org/bjornpiltz/gltests.
It is a minimal example wich works with Qt 4.8. (You need a trackpad to pinch.)