[mutter] (11 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:

  53692d8... window-actor: Split into two subclasses of MetaSurfaceActor

Commits added to the branch:

  d043d99... idle-monitor: avoid XSyncBadAlarm X error (*)
  d9659d4... wayland-surface: Don't crash when someone tries to run a na (*)
  bd1bec5... wayland-surface: Prefix xdg-shell methods with "xdg_shell_" (*)
  11aa3c0... wayland-surface: Don't require we manually bump the version (*)
  a66060e... Revert "Move window pings to MetaWindow" (*)
  f27f6aa... Update to new xdg-shell pinging standards (*)
  d39baeb... wayland-surface: Destroy the right thing (*)
  e3a0f2c... default: Don't wait to show the stage (*)
  2f45631... default: Use a consistent rand() for monitor backgrounds (*)
  2b5e7fb... window-group: Don't special-case the unredirected window
  3e8b042... window-actor: Split into two subclasses of MetaSurfaceActor

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