[gtk+] (44 commits) ...Merge branch 'gdk-backend-wayland'

[Kristian Høgsberg <krh src gnome org>]

Summary of changes:

  590f3df... Add Wayland backend (*)
  e6c1f5d... Dont iterate the display if there's nothing to write (*)
  7bbc158... Remove copy of grab enum that's now in wayland core (*)
  56de871... Create and attach buffer at process_updates time (*)
  799279d... Invalidate window on configure (*)
  7d29070... Implement GdkKeymap using libxkbcommon (*)
  a65fcd0... Hook up xkb_keysym_to_string and xkb_string_to_keysym (*)
  846e2c0... Remove leftover _gdk_windowing_set_cairo_surface_size() (*)
  1149c34... Clean up buffer handling a bit (*)
  541d517... Track 2.99.3 API changes (*)
  546069f... wayland: Use wayland-egl (*)
  3ef3433... wayland: Support setting cursors (*)
  c36dfcc... wayland: Consolidate device and devicemanager implementatio (*)
  de82b82... wayland: Clear modifier mask before restoring from keyboard (*)
  f7f1b59... wayland: Handle blank cursor (*)
  0583603... wayland: Actually return device in _gdk_wayland_device_get_ (*)
  3beb09a... wayland: Copy translate_keyboard_string() form x11 backend (*)
  1b918d1... wayland: Pretend selection works, print debug message (*)
  9f0ed18... wayland: Set event screen (*)
  f62e4a0... wayland: Use GDK_NOTE for logging event debug messages (*)
  df57389... wayland: Unref the keyboard focus surface when losing keybo (*)
  9e1a0a1... wayland: Fix indentation (*)
  4621c64... wayland: Send visibility event after map (*)
  df08154... wayland: Return surface coordinates and mask in window_at_p (*)
  b4129c1... gtkwidget: Only call X GDK functions when the window is an  (*)
  c3955ea... wayland: Add a few more cursors (*)
  f0fe810... wayland: Adjust the hw keycode in key events for min_key_co (*)
  0db8663... wayland: Copy gdk_wayland_keymap_translate_keyboard_state f (*)
  3b205de... wayland: Port over missing xkb functionality from X11 backe (*)
  22b9132... wayland: Keep a reference to the surface we last attached (*)
  6d20bcb... wayland: Fix hiding and withdrawing surfaces (*)
  cfb9c84... wayland: Remove some fprintf debug messages (*)
  cd91551... wayland: Fix resizing from other corners than just botton-r (*)
  4ca3e53... wayland: Drop GdkToplevelWayland and gdkwindow-wayland.h (*)
  f2ac8c7... wayland: Drop empty gdkscreen-wayland.h (*)
  6eac07d... wayland: Trim some unused struct fields (*)
  ffe3af7... wayland: There's only one screen (*)
  152dca4... wayland: Remove window cursor hash (*)
  1cd65ae... wayland: Only set x, y, and modifiers if the pointers are n (*)
  b513461... wayland: Map transient surfaces as such (*)
  287d91e... Merge remote-tracking branch 'origin/master' into gdk-backe (*)
  0e1041a... wayland: Add another cursor (left-ptr) (*)
  fcd58b0... wayland: Add modifier masks for meta, hyper and super keys (*)
  c7514e8... Merge branch 'gdk-backend-wayland'

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