[mutter] (13 commits) ...tests: Add tests for crossing events generated during ClutterGrab

[Marge Bot <marge-bot src gnome org>]

Summary of changes:

  bbc95c1... clutter: Add yet another grab API (*)
  a60658f... clutter: Add parameter to control the event emission root (*)
  40793e7... clutter: Make crossing events unstoppable (*)
  4595da0... clutter: Separate crossing event creation from emission (*)
  ba895ca... clutter: Emit crossing events along with ClutterGrabs becom (*)
  ec3b8fe... clutter: Propagate events only inside the grab (*)
  3e9d14c... clutter: Notify grab changes on the key focus (*)
  2e94efd... clutter: Only emit regular crossing events in the actors th (*)
  1713f79... clutter: Carry accounting of grabs in the ClutterActors hol (*)
  e9addb0... clutter: Add ClutterSeat private API to grab devices (*)
  eb30750... clutter: Integrate ClutterSeat grabs into ClutterGrab (*)
  7bfc472... clutter: Add specific event flag to tag "grab notify" cross (*)
  75f263d... tests: Add tests for crossing events generated during Clutt (*)

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