device type to get.
Return: a list of #GdkDevices. The returned list must be freed with g_list_free (). The list elements are owned by GTK+ and must not be freed or unreffed.
Deprecated: , use gdk_seat_get_pointer(), gdk_seat_get_keyboard() and gdk_seat_get_slaves() instead.
3.0
Returns the list of devices of type @type currently attached to @device_manager.