[clutter] (8 commits) ...clutter-actor: Add a 'has_overlaps' virtual

[Neil Roberts <nroberts src gnome org>]

Summary of changes:

  c3aa4d2... clutter-effect: Add a 'run' virtual (*)
  11443ed... clutter-offscreen-effect: Don't redraw the actor if cached  (*)
  00b733a... clutter-effect: Add clutter_effect_queue_rerun (*)
  9423214... clutter-actor-meta: Add an internal 'priority' property (*)
  8df8d4f... clutter-actor: Redraw or relayout when clearing effects or  (*)
  7f78237... clutter-actor: Add an 'offscreen-redirect' property (*)
  2a09a04... Add a conformance test for the offscreen-redirect property (*)
  701440e... clutter-actor: Add a 'has_overlaps' virtual (*)

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