[mutter] (11 commits) Non-fast-forward update to branch wip/fmuellner/flash-flash

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

The branch 'wip/fmuellner/flash-flash' 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:

  0a7be81... bell: Always flash window instead of frame
  d0cfb6e... frame: Remove flashing support

Commits added to the branch:

  d83a325... Revert "Revert "cogl: Pick glReadPixels format by target, n (*)
  a871d56... cogl: Revert swizzling for BGRA buffers (*)
  efb1ee9... Bump version to 3.32.0 (*)
  1574099... prefs: Change default of show-fallback-app-menu (*)
  80ceeb2... keybindings: Fix theoretical memory leak while ungrabbing (*)
  32504ae... meta-monitor: Remove useless variable (*)
  a555a2c... cogl: Remove unused CoglTextureDriver::try_setting_gl_borde (*)
  9aca31c... cogl: Introspect CoglTexture2D(Sliced) (*)
  8a87e87... shadow-factory: Update shadow of attached modals (*)
  f9b92b8... bell: Always flash window instead of frame
  ebdf0e8... frame: Remove flashing support

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