[gtk] (3 commits) Non-fast-forward update to branch x11-dnd-fixes

[Matthias Clasen <matthiasc src gnome org>]

The branch 'x11-dnd-fixes' 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:

  6a984a7... x11: Fix dnd coordinate handling
  d7771f3... Add detail to gdk_drag_begin docs

Commits added to the branch:

  14122d1... x11: Export gdk_x11_surface_get_root_coords privately
  7c1cfc5... x11: Fix dnd coordinate handling
  ec383a2... Add detail to gdk_drag_begin docs