[mutter] (6 commits) Non-fast-forward update to branch wip/another-16bpp-crasher

[Jonas Ådahl <jadahl src gnome org>]

The branch 'wip/another-16bpp-crasher' 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:

  a4972ac... Revert "iconcache: Support 16bit icons"
  e51323f... iconcache: Avoid xrender picture formats when creating cair

Commits added to the branch:

  ad13821... window-actor: Add 'damaged' signal (*)
  65fde26... screen-cast/window: Use window actor damaged signal instead (*)
  96e831d... window-actor: Add API to get a cairo surface of the window (*)
  cd0990c... window-actor: Use new get_image() API to screen casting win (*)
  1a5cba5... Revert "iconcache: Support 16bit icons"
  556e769... iconcache: Avoid xrender picture formats when creating cair

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