I have read that QGraphicsView is supposed to automatically expand when any of its components spill over its edges, if I understand correctly but this is not what I'm seeing. When I zoom into an image, the view scrollbars appear and then its game over for the zoom.

I've tried various things with itemsBoundingRect, sceneRect(), fitInView, BoundingRectViewportUpdate but nothing has improved the situation from the code I've already posted.