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QGraphicsItem.setPos(0,0) is not top-left corner.
@sonichy https://stackoverflow.com/questions/37684777/how-do-i-make-the-top-left-of-a-qgraphicsscene-coincide-with-the-top-left-of-my https://forum.qt.io/topic/44436/change-qgraphicsview-scene-to-have-coords-system-origin-at-top-left-corner
@JonB QGraphicsView::setAlignment(Qt::AlignLeft | Qt::AlignTop)