Blender Git Loki

Fix T38691: Curve object bevel not working in group instance

It is possible that objects from dupli-groups depends on objects which are
not in the dupli-group. We do need this objects to be evaluated as well on
visible changes, so all dependencies for objects from the dupli-group are
met. Unfortunately, we don't have parent relations on this state, so we're
to use DFS over the whole DAG to gather such dependencies.

This is probably not so bad since visible update is called really rarely.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D326