[gtk] (5 commits) Non-fast-forward update to branch wip/carlosg/x11-dnd

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/x11-dnd' 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:

  8815ad3... gdk/x11: Serialize gtype content formats before sending Xdn
  3442881... gdk/x11: Ensure to sync type list after sending XdndEnter
  1148829... gdk/x11: Ensure to hide DnD surface after failed operation

Commits added to the branch:

  682068f... gdk/x11: Serialize gtype content formats before sending Xdn
  fe36c24... gdk/x11: Ensure to sync type list after sending XdndEnter
  5aad3d7... gdk/x11: Ensure to hide DnD surface after failed operation
  4716c9a... gdkdrag/x11: Drop timestamp argument from gdk_drag_do_leave
  357e215... gdkdrag/x11: Issue XdndLeave on cancellation