[mutter] (22 commits) Non-fast-forward update to branch wip/surface-content

[Jasper St. Pierre <jstpierre src gnome org>]

The branch 'wip/surface-content' 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:

  c116d92... Always map the client and frame windows
  82728ee... compositor: Remove meta_compositor_window_[un]mapped
  30c46b1... compositor: Remove pending_input_region
  14d921f... surface-actor: Move unobscured_region processing here
  7d057e5... window-actor: Simplify the unredirected check in cull_out
  278e731... compositor: Simplify the unredirected window management cod
  44665f0... window-actor: Flip set_redirected around
  cdf1c22... window-actor: Remove old unused APIs
  e10dfcf... Move position-changed / size-changed signals to the MetaWin
  9f6de8e... window-actor: Split CLIENT_TYPE into two subclasses of Meta
  6d7a843... window: Delay the showing of XWayland clients until set_win

Commits added to the branch:

  c3b0fae... main: Make sure to free any events that we get from Clutter (*)
  799c274... wayland: Report error when trying to stack subsurface incor (*)
  16de7f6... wayland: Make wl_subsurface.set_position properly synchroni (*)
  9348c9b... wayland: Make wl_subsurface.place_(above|below) properly sy (*)
  4f4b1bf... wayland: Support wl_subsurface.set_sync/set_desync (*)
  55b18f9... window: Add "skip-taskbar" property (*)
  45cb151... window-actor: Fix unobscured_region handling when computing (*)
  1a62ac9... xwayland: Shuffle some code around (*)
  225e20a... wayland: Remove superfluous "wayland_" from arguments (*)
  7d3012f... screen: Make the guard window an InputOnly window (*)
  9edff6f... wayland: Use wl_callback_send_done (*)
  a09fa3b... wayland: Clean up the parallels between creating callbacks  (*)
  60d9bee... window-actor: Simplify the unredirected check in cull_out (*)
  d628271... compositor: Simplify the unredirected window management cod (*)
  39fee9f... window-actor: Flip set_redirected around (*)
  b9755ea... window-actor: Remove old unused APIs (*)
  d5d5c21... compositor: Remove pending_input_region (*)
  b9f6ebe... Always map the client and frame windows
  dff974d... surface-actor: Move unobscured_region processing here
  578080a... Move position-changed / size-changed signals to the MetaWin
  b9ac06f... window-actor: Split CLIENT_TYPE into two subclasses of Meta
  0a524cd... window: Delay the showing of XWayland clients until set_win

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