[mutter] (23 commits) Non-fast-forward update to branch wip/carlosg/performance-improvements

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/performance-improvements' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  0b9ff53... ClutterActor: Avoid frequent signal emission if possible
  29c3e04... ClutterPaintNode: Avoid clearing the background on the root
  891ae14... cogl: Mark vertex buffers as dynamic
  bad7990... ClutterActor: Preserve valid paint volumes till the next re
  d29f4e9... ClutterActor: Call queue_redraw vfunc directly if possible
  5f9eacc... backends/native: Avoid generic closure marshaler for page f
  e1a1f83... ClutterActor: Optimize away idempotent scale/position updat
  24f935e... wayland: Collect frame completion time once for all surface
  06305e7... ClutterStage: Use non-generic marshaller for ::presented si
  cefe001... ClutterStage: Store clip area as a region
  78ff617... compositor: Use redraw clip region to cull out children
  6704fa1... compositor: Avoid redoing the background pipeline on each p
  d2cbd2f... clutter: Avoid rounding compensation when invalidating 2D a

Commits added to the branch:

  d3362a6... clutter: conform/actor-graph: Add missing null-termination (*)
  2b1537c... Update Catalan translation (*)
  a61e59b... ClutterActor: Avoid frequent signal emission if possible
  e77f8f0... cogl: Mark vertex buffers as dynamic
  91309a2... ClutterActor: Preserve valid paint volumes till the next re
  2be35a2... ClutterActor: Call queue_redraw vfunc directly if possible
  d20a3c1... backends/native: Avoid generic closure marshaler for page f
  213e884... ClutterActor: Optimize away idempotent scale/position updat
  3ced67d... wayland: Collect frame completion time once for all surface
  bc5c47e... ClutterStage: Use non-generic marshaller for ::presented si
  32da0fc... ClutterStage: Store clip area as a region
  c702e5d... compositor: Use redraw clip region to cull out children
  cc74583... clutter: Avoid rounding compensation when invalidating 2D a
  af973f9... compositor: Ensure to clip partial shadow redraws
  b610b13... backends: Store MUTTER_STAGE_VIEWS envvar content just once
  cf7d9cb... wayland: Use weak ref to keep track of buffers
  e4c05b2... wayland: Use notify::allocation notification to update surf
  39fe4b2... compositor: Remove MetaSurfaceActorWayland::painting signal
  f3b0aba... clutter: Add ClutterPaintVolume argument to ClutterActor::q
  0a60619... compositor: Avoid changing pipeline/source if shadow is not
  c93ff67... compositor: Use queue_redraw vmethod over repaint-scheduled
  16b2be2... compositor: Remove MetaSurfaceActor::repaint-scheduled sign
  123807a... cogl: Ensure to only clear the depth buffer if depth testin

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