[mutter] (12 commits) ...clutter/actor: Don't push identity transforms

[verdre <jonasd src gnome org>]

Summary of changes:

  8a709b5... clutter/stage: Add pick trace (*)
  a4961ad... clutter/pick-context: Make pick context aware of the pick m (*)
  05b6b6a... clutter/actor: Use pick context in clutter_actor_should_pic (*)
  8d47f79... clutter/actor: Remove '_paint' suffix from clutter_actor_sh (*)
  56ed0bf... clutter: Remove pick mode from context (*)
  0d79a0f... clutter/stage: Remove useless cached pick mode reset (*)
  f411834... Introduce ClutterPickStack (*)
  620f0ad... clutter/pick-stack: Store current matrix entry (*)
  7d25cbe... Use graphene_ray_t to pick actors (*)
  54db1b2... clutter/actor: Remove cached inverse transform (*)
  ce6f133... clutter/pick-context: Remove clutter_pick_context_get_frame (*)
  da7671b... clutter/actor: Don't push identity transforms (*)

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