[gtk] (6 commits) Non-fast-forward update to branch dnd-gestures-2

[Matthias Clasen <matthiasc src gnome org>]

The branch 'dnd-gestures-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:

  a895439... dragsource: Drop gtk_drag_source_drag_begin
  31c1a6a... docs: Remove the dnd section
  884c1ba... docs: Remove dropped drag source apis
  7896be6... docs: Add GtkDropTarget section
  2ac5490... docs: Add GtkDragIcon

Commits added to the branch:

  77c0919... dragsource: Drop gtk_drag_source_drag_begin
  89af20d... docs: Remove the dnd section
  ac51598... docs: Remove dropped drag source apis
  4f88209... docs: Add GtkDropTarget section
  3531d1b... docs: Add GtkDragIcon
  ac05730... docs: Expand the GDK dnd docs