[mutter] (15 commits) Non-fast-forward update to branch wip/carlosg/unassorted-perf-fixes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'wip/carlosg/unassorted-perf-fixes' 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:

  5f87f28... clutter: Avoid rounding compensation when invalidating 2D a
  f6c7dd6... compositor: Avoid changing pipeline/source if shadow is not
  20d7fe6... cogl: Ensure to only clear the depth buffer if depth testin
  77b9e9d... Revert "Revert "ClutterActor: Optimize away idempotent scal

Commits added to the branch:

  4786cc8... monitor-config-manager: Round layout size after scaling (*)
  e4a2d15... display: Code cleanups (*)
  c388a8f... display: Ceil pointer cursor theme scale when fractional (*)
  4baefe4... clutter/stage: Round viewport coordinates before setting (*)
  7821256... monitor-manager-dummy: Allow to pass extra monitor specs vi (*)
  eacf2f2... backends/x11/nested: Draw the stage view CRTCs with the cor (*)
  c5471e5... renderer-x11-nested: Use rounded width/heights for fb size (*)
  9004253... cogl: remove CoglFuncPtr, use GCallback instead (*)
  9a84385... clutter: Make paint volume argument const on queue_redraw*( (*)
  bf4ccd2... clutter: Avoid relayouts when raising/lowering children (*)
  ffaec91... clutter: Only redraw affected portions on parent widget on  (*)
  582a880... clutter: Avoid rounding compensation when invalidating 2D a
  8ef0db1... compositor: Avoid changing pipeline/source if shadow is not
  0aaf7df... cogl: Ensure to only clear the depth buffer if depth testin
  89ef972... Revert "Revert "ClutterActor: Optimize away idempotent scal

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