2008-10-11  Michael Natterer  <mitch@gimp.org>

	Fix old bug in the GimpContainer implementation that wasn't
	visible before the drawable stack completly b0rked when removing
	the second-last item:

	* app/core/gimpcontainer.c: add default implementations of ::add()
	and ::remove() and update container->num_children there instead of
	in the gimp_container_add() and _remove() wrapper functions.
	This way not only external callbacks connected to the "add" and
	"remove" signals are called with the correct num_children, also
	implemtations of ::add() and ::remove() in subclass have the right
	number available before/after upchaining. Add paranoia code to the
	wrapper functions which check if the subclass reall chains up.

	* app/core/gimplist.c: chain up in add() and remove().


svn path=/trunk/; revision=27227