[gtk] (30 commits) Non-fast-forward update to branch dnd-gestures

[Matthias Clasen <matthiasc src gnome org>]

The branch 'dnd-gestures' 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:

  3ce4618... marshalers: Add another
  fe3ede3... docs: Add content format api
  fb1668f... Add a GtkDragSource object
  a28e6a7... dnd: Patch up gtk_drag_get_source_widget
  f2f3bd9... label: Port to GtkDragSource
  362fb8b... linkbutton: Port to GtkDragSource
  bb441a2... calendar: Port to GtkDragSource
  0f3023c... entry: Port icon dnd to GtkDragSource
  d6698cf... text: Convert to GtkDragSource
  0690da9... textbuffer: Add a content provider api
  543b9f7... textview: Port to GtkDragSource
  cc5ec6e... Add (de)serializers for GdkRGBA
  062fb31... Add a generic callback content provider
  90b8c17... colorbutton: Port to GtkDragSource
  c87fc75... colorswatch: Convert to GtkDragSource
  b4c9758... pathbar: Convert to GtkDragSource
  1a88338... gtk-demo: Convert the clipboard demo to GtkDragSource
  70c4678... iconbrowser: Port to GtkDragSource
  136e180... Add another callback-based provider
  b8ab646... iconview: Port to GtkDragSource
  ef305ae... placessidebar: Port to GtkDragSource
  8eb73be... treeview: Port to GtkDragSource
  0436d0b... filechooser: Port to GtkDragSource
  691c5dc... notebook: Port to GtkDragSource
  8646827... tests: Convert to GtkDragSource
  9a9a9fe... Remove traditional drag source API
  7f33e31... docs: Mention DND in the migration guide
  ebe2958... Move the rest of the drag-source api over
  e9d8131... Hook up the GtkDragSource docs

Commits added to the branch:

  f7f06f8... stackswitcher: Fix switch-while-drag functionality (*)
  5087ddf... marshalers: Add another
  5b6343b... docs: Add content format api
  b140e53... Add a GtkDragSource object
  bb45575... dnd: Patch up gtk_drag_get_source_widget
  70d721e... label: Port to GtkDragSource
  00ab41f... linkbutton: Port to GtkDragSource
  bde3863... calendar: Port to GtkDragSource
  b8ebe37... entry: Port icon dnd to GtkDragSource
  9c28c07... text: Convert to GtkDragSource
  d85c431... textbuffer: Add a content provider api
  65018ba... textview: Port to GtkDragSource
  836ddb9... Add (de)serializers for GdkRGBA
  02c9f1c... Add a generic callback content provider
  4cde1c5... colorbutton: Port to GtkDragSource
  c3b3fe4... colorswatch: Convert to GtkDragSource
  90f9537... pathbar: Convert to GtkDragSource
  45e72a9... gtk-demo: Convert the clipboard demo to GtkDragSource
  6b31016... iconbrowser: Port to GtkDragSource
  0b35b50... Add another callback-based provider
  7912c59... iconview: Port to GtkDragSource
  b68da21... placessidebar: Port to GtkDragSource
  3c1723f... treeview: Port to GtkDragSource
  a709b95... filechooser: Port to GtkDragSource
  8058ed1... notebook: Port to GtkDragSource
  8c62421... tests: Convert to GtkDragSource
  ebd27e2... Remove traditional drag source API
  a214d98... docs: Mention DND in the migration guide
  f964d62... Move the rest of the drag-source api over
  ee74fc4... Hook up the GtkDragSource docs

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