[gtk] (19 commits) ...Merge branch 'global-coords' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  e702a33... menuitem: Introduce gtk_menu_item_get_menu_shell() (*)
  d971c4e... menu: Simplify function (*)
  4e464b4... menu: Only set position in one place (*)
  f645c4e... menu: Remove global coordinates (*)
  c7f06dd... win32: Stop using gdk_event_get_root_coords (*)
  17cd6d7... widget: Stop setting root coords in events (*)
  57175dd... Drop gdk_event_get_root_coords (*)
  ae1ba79... menu: Use a box (*)
  13e010d... menu: Use a scrolled window (*)
  3f6272f... More menu restructuring (*)
  8ba3c75... More menu work (*)
  e599336... menu: Keep selected item in view (*)
  ace30d4... menu: Bring back the scroll keybindings (*)
  6c201e7... menu: Fix keynav between submenus (*)
  feef0ef... menu: Fix destruction (*)
  0a33d74... tests: Fix issues with menu shells (*)
  fcdea03... Fix menu item accessible (*)
  e31190c... Update css node results (*)
  0c7e567... Merge branch 'global-coords' into 'master'

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