Endless loop when setting Qml Item's focus (with minimal testcase)

Please start the application im QmlViewer.

After the second click on "Move" the application will freeze.

Qt will hang in QGraphicsItemPrivate::setFocusHelper because there's a circular reference between declarative items and their focus scopes.

If the FocusScope with id f is changed to an Item, the bug disappears (however the example is a heavily stripped down version of real application where the outer FocusScope is needed).