[gtk] (12 commits) Non-fast-forward update to branch keymap-rework-2

[Matthias Clasen <matthiasc src gnome org>]

The branch 'keymap-rework-2' 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:

  f238efe... gdk: Make GdkKeymap a private api
  ada22d6... keymap: Remove virtual modifier mapping functions
  618aba5... gtk: Stop using modifier intents
  cc3f6c0... gtk: Drop gtk_widget_get_modifier_mask
  ef34cf6... display: Remove gdk_display_get_modifier_mask
  08b7f63... Remove uses of modifier intents in gdkevents.c
  1a479c8... gdk: Remove gdk_keymap_get_modifier_mask
  b685825... Drop gtk_accelerator_set_default_mod_mask
  e26a1ea... Reshuffle keymap docs
  512cc55... accelgroup: Small documentation updates
  66189f8... Update migration guide
  e36bc17... reftests: Comment out a test that fails only in ci

Commits added to the branch:

  eaf96b9... gdk: Make GdkKeymap a private api
  507ac8e... keymap: Remove virtual modifier mapping functions
  ed761c7... gtk: Stop using modifier intents
  83ea980... gtk: Drop gtk_widget_get_modifier_mask
  b906b16... display: Remove gdk_display_get_modifier_mask
  b6b671d... Remove uses of modifier intents in gdkevents.c
  fbc741d... gdk: Remove gdk_keymap_get_modifier_mask
  c001dc2... Drop gtk_accelerator_set_default_mod_mask
  d0c5d74... Reshuffle keymap docs
  ffed5ca... accelgroup: Small documentation updates
  52d54f9... Update migration guide
  e156ba6... reftests: Comment out a test that fails only in ci