[mutter] (15 commits) Created branch wip/carlosg/x11less-preparations

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/x11less-preparations' was created.

Summary of new commits:

  ae65939... x11: Make error trap API NULL safe
  15b2757... x11: Move focus sentinel to MetaX11Display
  10d9224... core: Do not synchronize stack with Xserver if there is no 
  dd2fcd4... core: Avoid grab transfer shenanigans with non-X11 backend
  a90727c... core: Separate checks for pointer barriers availability
  505d772... x11: Move X11 calls to map/unmap a MetaWindow to MetaWindow
  6e6c7fd... core: Relax requirement that MetaWindow shall have icon/min
  7474ace... x11: Separate X11 focus handling into MetaX11Display method
  c9d9b76... x11: Split X11 focus change requests to a separate function
  b243a60... core: Untangle input focus management
  b0c42cf... core: Add explicit init/shutdown_x11() MetaDisplay calls
  a8edf3d... x11: Unmanage X11 windows on MetaX11Display finalization
  af875b5... x11: Initialize GdkDisplay together with MetaX11Display
  f666f24... wayland: Split Xwayland initialization in 2 steps
  80438af... x11: protect against null MetaX11Display when looking up X1