Blender Git Loki

Collections: change active if hidden or excluded

When the active collection is hidden or excluded, change the active
collection to the first visible parent collection. This behavior existed
previously for excluding collections, and is now expanded to also
switch the active collection when viewport hidden or restricted.

This does not prevent viewport hidden or restricted collections from
being reactivated later. This could be added as a separate commit.
Excluded collections cannot be activated, so it may make sense to
extend this behavior to hiding collections.