[mutter] (21 commits) Non-fast-forward update to branch gbsneto/cleanup-x11-from-window-actor

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

The branch 'gbsneto/cleanup-x11-from-window-actor' 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:

  205678c... window-actor: Turn into a derivable class
  2a61c30... Add MetaWindowActorX11 and MetaWindowActorWayland
  3162156... window-actor: Select X11 or Wayland actor based on client t
  1e7988a... window-actor: Move X11-specific code to MetaWindowActorX11
  2299294... window-actor: Cleanup includes
  5d2220c... Document window and surface actors
  e523574... window-actor: Move some code to MetaCompositor

Commits added to the branch:

  177d0c2... gpu/kms: Use correct DRM event context version (*)
  b329256... cogl/texture-2d-gl: Try to determine format for external te (*)
  c681cce... cogl/texture-2d-gl: Bind correct target when getting data (*)
  eac1864... cogl/texture: Add API to check whether _get_data() will wor (*)
  37e36e8... compositor: Make meta_actor_painting_untransformed take a f (*)
  e1370ee... shaped-texture: Put actual texture painting in helper (*)
  36b46af... boxes: Add helper to scale rectangles by a double (*)
  1755a8b... shaped-texture: Fix include order (*)
  d3301d6... shaped-texture: Stop using gdk rect helper (*)
  f9118fb... shaped-texture: Don't change the callers clip rect (*)
  c84d7eb... shaped-texture: Get transformed textures pixels via offscre (*)
  012691b... shaped-texture: Draw external textures via offscreen (*)
  ded24c8... window-actor: Turn into a derivable class
  10f3ab2... Add MetaWindowActorX11 and MetaWindowActorWayland
  0a95588... window-actor: Select X11 or Wayland actor based on client t
  14c0cfa... window-actor: Move X11-specific code to MetaWindowActorX11
  552ebd3... window-actor: Cleanup includes
  3fe7f56... Document window and surface actors
  133f190... window-actor: Move window actor creation to MetaCompositor
  8c007e9... window-actor: Remove post_init() vfunc
  a290a59... window-actor: Turn into an abstract class

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