Apply patch from Nils Barth and David Santiago to improve submenu

Apply patch from Nils Barth and David Santiago to improve submenu

Fri Sep  1 22:39:07 2000  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkmenu.[ch] TODO.xml: Apply patch from
	Nils Barth and David Santiago to improve submenu
	navigation. The patch does this by creating a triangular
	region from the point where the pointer leaves the
	menu to the submenu.  While the pointer is in
	that region and a timeout has not expired, events
	that would cause the active submenu to change are
	ignored.