3.19.6:

Gtk:
* TextIter: Add starts_tag(), deprecate begins_tag().
  (Kjell Ahlstedt)
* TreeView: Fix a crash in get_tooltip_context_path()
  (Kjell Ahlstedt) Bug #760030.

Gdk:
* Add Gdk::Seat
  (Kjell Ahlstedt) Bug #759806.
* Device:
  - Add get_seat().
  - Deprecate grab() and ungrab().
   DeviceManager, Display: Add and deprecate
  (Kjell Ahlstedt) Bug #759806.
* DeviceManager: Deprecate list_devices() and get_client_pointer().
  (Kjell Ahlstedt) Bug #759806.
* Display:
  - Deprecate get_device_manager().
  - Add list_seats(), get_default_seat(), signal_seat_added() and
  signal_seat_removed().
  (Kjell Ahlstedt) Bug #759806.

Build:
* C++11: Use the override keyword, instead of virtual, for suitable destructors.
  (Murray Cumming)