We already have dedicated outliner visibility operators that not only
take precedent over those ones, but also unhide collections as well.
No change for the end user. That said, since I added the outliner
hide/unhide operators I assumed that newly visible objects are to be
selected. That can change in a separate commit, but it should be done
by changing OUTLINER_OT_unhide_all.
Reviewers: brecht
Differential Revision: https://developer.blender.org/D4527
4510f88d00