Blender Git Commit Log

Collections: more work on unification with groups

* Removes the special exceptions for group reference counting. Unlinked
collections now get a faker user. The weak point here is that unlinked
collections retain their objects even if they are removed from the scene.
For some cases that's good, for tag-like collections that's not ideal.
We can investigate how that make those cases work better later.

* Depsgraph view layer evaluation was fixed to work with copy-on-write, and
the code was simplified in the process.

* Various bugfixes related to static overrides, linking and outliner.