Object's selection box now includes the bounds of all of its
descendants. Selection boxes of immediate children of a selected
object are also drawn.
Individual/group selection buttons also now work as expected.
Change-Id: Ice7ef9a536e32c6bb6da70fe23bf0a38e72c14f8
Fixes: QDS-1210
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>