[mutter] (5 commits) ...cullable: Turn cull_out / reset_culling into a separate interface

[Jasper St. Pierre <jstpierre src gnome org>]

Summary of changes:

  f0bc53c... display: Fix logic for determining whether our focus was su (*)
  ce3804e... display: Use MetaWindow for auto-raise callbacks (*)
  59a0113... window-group: Decompose culling operations into two methods (*)
  d8c6607... window-actor: Move the operations we need to do when we cul (*)
  4714425... cullable: Turn cull_out / reset_culling into a separate int (*)

(*) This commit already existed in another branch; no separate mail sent