It would be nice to have QGraphicsItem::setScale(qreal, qreal) so that one can apply different scale factor for width and for height.

It seems that many people lack such a function:

• https://stackoverflow.com/questions/30255375/relation-between-qtransform-scale-and-boundingrect-size#comment48646368_30260569

A new method QGraphicsItem::scale() should also be implemented. For now, I do not have a clear idea for the return type.