QGraphicsView::centerOn changes scrollbars but not transform

When calling QGraphicsView::centerOn(QPointF) it will modify the horizontal and vertical scroll bars. It does not however sync the viewport transform. As such it becomes 'out of sync'.

Below a pyside2 script that illustrates the problem: 

pixmapitem = QGraphicsPixmapItem()

pixmapitem.setPixmap(...)

view.scene().addItem(pixmapitem)

print(view.transform())

view.fitInView(pixmapitem, Qt.KeepAspectRatioByExpanding)

print(view.transform()) # unchanged wrt previous print

 

Expected behavior: both scrollbars and the transform is updated.

A possible solution could be the following 'code' for centerOn that will modify the transform.

QGraphicsView::centerOn(QPointF center)
{
   current_center = mapToScene(viewport().rect().center());
   translate(current_center.x() - center.x(), current_center.y() - center.y());
}

 This will also update the scrollbars via centerView call in setTransform.