atk4/atk4-addons — pull request #24 by DarkSide666 (2012-09-25 14:17:04+00:00)
Title: Update hierarchy/lib/Form/Field/drilldown.php

Fix for hierarcy/drilldown field. It now compares also models before restricting to create "loops".
I tested that in project I develop. It looks that it's working fine now.