Some QWindow subclass rely on those events to be sent to know when
the window geometry changes (e.g. QQuickCanvas).
Change-Id: I16d3928803d09761f265544fdf10a5d080fccc17 Reviewed-by: Sean Harmer <sean.harmer@kdab.com> Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>