[mutter] (41 commits) Non-fast-forward update to branch wip/tintou/add-nullable

[Corentin Noël <corentinnoel src gnome org>]

The branch 'wip/tintou/add-nullable' 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:

  a617c7d... workspace-manager: get_workspace_by_index can return NULL
  bc757cc... background: set_file accepts NULL files

Commits added to the branch:

  d992722... cogl: correct check for COGL_OFFSCREEN_DISABLE_DEPTH_AND_ST (*)
  d48fec8... cogl: drop extraneous parentheses (*)
  d3afe43... test: use correct enum (*)
  c039764... clutter: Remove unused deprecated/clutter-keysyms.h (*)
  6da568e... clutter: Remove unused deprecated/clutter-stage-manager.h (*)
  375d35b... clutter: Remove unused deprecated/clutter-animatable.h (*)
  0a41f0f... clutter: Remove unused deprecated/clutter-bin-layout.h (*)
  3e9f847... clutter: Remove unused deprecated clutter_container_{add,re (*)
  c74f4f6... clutter: Remove some unused deprecated clutter_table_layout (*)
  24b38a5... clutter: Remove some unused deprecated clutter_animation AP (*)
  293ec0a... clutter: Remove some unused deprecated clutter_state API (*)
  c4d1e15... clutter: Remove some unused deprecated clutter_alpha API (*)
  289e24f... clutter: Remove some unused deprecated clutter_actor API (*)
  7adaaab... clutter: Remove deprecated ClutterTableLayout (*)
  46b3811... wayland: Drop unused wl_signal structs (*)
  e7b2f96... wayland: Avoid redundant cancel() call (*)
  48639ac... wayland: Do not cancel data source on offer destruction (*)
  e5af790... wayland: Move "ownership" of the DnD selection source to th (*)
  794d323... cogl: Remove deprecated cogl_color_set_from_* (*)
  0d006bc... cogl: Remove unused deprecated cogl_matrix_ortho (*)
  1076b31... cogl: Remove unused deprecated cogl_onscreen_{add,remove}_s (*)
  c6f5b7f... cogl: Remove unused deprecated cogl_framebuffer_{,v}draw_* (*)
  c69dc75... cogl: Remove unused includes of cogl-vertex-buffer-private. (*)
  13fd213... cogl: Remove unported test-vertex-buffer-mutability (*)
  23e9fd3... cogl: Remove unused COGL_OBJECT_DEFINE_DEPRECATED_REF_COUNT (*)
  8cac823... cogl: Remove unused CoglPipelineProgramType (*)
  f5050a4... cogl: Remove unused CoglPipelineFragend::pipeline_set_paren (*)
  e922c64... cogl: Remove unused CoglPipelineFragend::passthrough (*)
  5aa971b... cogl: Collapse some COGL_PIPELINE_{VERT,FRAG,PROG}END array (*)
  22d1feb... cogl: Remove unused CoglShaderLanguage (*)
  92375c7... cleanup: Use g_clear_signal_handler() where possible (*)
  51f68f1... clutter/cally-root: Use g_clear_signal_handler and fix a si (*)
  8e172ae... cleanup: Use g_clear_handle_id() for g_source_remove() (*)
  a1116bc... cogl: Add support for clipping regions (*)
  8598b65... clutter/cogl: Use regions for clipping if necessary (*)
  e44bd2e... compositor: Use redraw clip region to cull out children (*)
  a586f6a... cogl: Drop unused struct field (*)
  353d790... clutter: Check updated devices with the current clip (*)
  f4bf48a... clutter: Drop unused API (*)
  4cccba5... workspace-manager: get_workspace_by_index can return NULL
  5582d7b... background: set_file accepts NULL files

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