[mutter] (22 commits) Non-fast-forward update to branch gbsneto/effects-paint-nodes

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

The branch 'gbsneto/effects-paint-nodes' 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:

  0f1289e... clutter/effect: Don't expose pre and post paint helpers
  e8f9d09... Introduce ClutterEffectNode
  35af306... clutter/effect: Add paint_node vfunc
  0d51678... clutter/offscreen-effect: Clear framebuffer on pre_paint
  e0a8e82... clutter/offscreen-effect: Simplify paint
  6be6f04... clutter/paint-nodes: Add opacity overriding to ClutterActor
  6f0719b... clutter/paint-nodes: Don't skip pipeline node constructor
  03be5ed... clutter/paint-nodes: Add new ClutterLayerNode API
  c261eb7... clutter/paint-nodes: Push and pop framebuffer even without 
  96e8074... clutter/paint-nodes: Add serialization to layer node
  5d7edde... Introduce ClutterBlitNode

Commits added to the branch:

  826573c... Fix broken markup in Hausa UI translation (*)
  ae83a61... clutter/actor: Remove actors from shallow relayout list whe (*)
  249274c... clutter/actor: Pass stage as user_data when unrealizing (*)
  3a47455... cogl-texture-2d: Flush the journal before mipmapping (*)
  32dbcd9... background-content: Mipmap background texture rendering (*)
  d722e59... window-actor/wayland: Remove custom get_paint_volume() vfun (*)
  dfa235a... clutter/actor: Add API to get fixed position (*)
  03d177c... clutter/actor: Add position argument to allocate_preferred_ (*)
  65aa476... tests/stage-view: Keep old stage views alive on hotplug (*)
  30d9d19... Bump version to 3.37.3 (*)
  ecaaccb... background: Use NEAREST filtering when the texture is the m (*)
  7de6995... clutter/effect: Don't expose pre and post paint helpers
  20557f8... Introduce ClutterEffectNode
  74ed680... clutter/effect: Add paint_node vfunc
  0616628... clutter/offscreen-effect: Clear framebuffer on pre_paint
  8f2a481... clutter/offscreen-effect: Simplify paint
  5d43aaf... clutter/paint-nodes: Add opacity overriding to ClutterActor
  dfb1801... clutter/paint-nodes: Don't skip pipeline node constructor
  dea5110... clutter/paint-nodes: Add new ClutterLayerNode API
  5855ee3... clutter/paint-nodes: Push and pop framebuffer even without 
  f2af1e7... clutter/paint-nodes: Add serialization to layer node
  027f9d6... Introduce ClutterBlitNode

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