2000-09-07  Mathieu Lacage  <mathieu@eazel.com>

	* components/tree/nautilus-tree-view.c: add support for NautilusDragInfo.
	* libnautilus-extensions/nautilus-drag.c: add new scroll calculation fucntion.
	(nautilus_drag_autoscroll_calculate_delta):
	* libnautilus-extensions/nautilus-drag.h: add decalrtion of scroll function
	plus bits and pieces of constants used everywhere.
	* libnautilus-extensions/nautilus-icon-dnd.c:
	(auto_scroll_timeout_callback): move this to the shared version of the scroll
	* libnautilus-extensions/nautilus-list.c: implement auto scrolling.
	(nautilus_list_drag_leave), (nautilus_list_real_scroll),
	(auto_scroll_timeout_callback), (nautilus_list_start_auto_scroll),
	(nautilus_list_stop_auto_scroll), (nautilus_list_drag_motion):