[mutter] (4 commits) Non-fast-forward update to branch wip/carlosg/drop-no-clear-hint

[Jonas Ådahl <jadahl src gnome org>]

The branch 'wip/carlosg/drop-no-clear-hint' 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:

  e075301... tests: Explicitly set a background color for offscreen acto
  77bc1ea... clutter: Drop the no-clear stage hint

Commits added to the branch:

  ae238d1... window: Add adjust_fullscreen_monitor_rect virtual method (*)
  dbb95cb... window-xwayland: Add Xwayland fullscreen games workaround (*)
  2202c0d... tests: Explicitly set a background color for offscreen acto
  1688cf7... clutter: Drop the no-clear stage hint

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