Library overrides crashed with on trying to access the interface root
panel. The root panel should not be exposed through RNA, but also
accessing its position property should be allowed.
Several fixes here:
- Fix position property getter when the item has no parent panel
(i.e. the root panel).
- Avoid infinite loops in the greedy override comparison: exclude the
loopback parent property.
- Don't return the root panel via the parent property in the first
place, just return nullptr.
Second attempt at fix, first one in #111755 broke the
bl_node_group_interface test due to incorrect handling of the nullptr
parent case (reverted by 68440742)
Pull Request: https://projects.blender.org/blender/blender/pulls/111782
cf12d11de6