[mutter] (9 commits) Non-fast-forward update to branch wip/carlosg/async-xwayland-startup

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/async-xwayland-startup' 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:

  6892348... tests: Ensure MetaX11Display is initialized before running 
  f87de21... tests: Set fatal log handler on clutter tests
  42cb4a9... core: Make meta_display_init_x11() an async function
  9f4151c... xwayland: Do not block on Xwayland initialization

Commits added to the branch:

  cbef49f... shaped-texture: Remove unused meta-cullable header (*)
  ae1768b... wayland/actor-surface: Do not use geometry scale to constra (*)
  d8b7905... surface-actor: Scale unobscured and clip region by geometry (*)
  56ce253... cullable: Factor out untransformed check into a vfunc (*)
  264f688... surface-actor: Implement meta_cullable_is_untransformed int (*)
  98776cb... tests: Ensure MetaX11Display is initialized before running 
  8ca343c... tests: Set fatal log handler on clutter tests
  65465e1... core: Make meta_display_init_x11() an async function
  bab1f9f... xwayland: Do not block on Xwayland initialization

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