TreeModel vfuncs: iter_children() and iter_nth_child()

[Murray Cumming <murrayc murrayc com>]

GtkTreeModel has both iter_children()
http://cvs.gnome.org/lxr/source/gtk+/gtk/gtktreemodel.h#99
and iter_nth_child()
http://cvs.gnome.org/lxr/source/gtk+/gtk/gtktreemodel.h#106
callbacks:

But
  model->iter_children(iter, parent)
seems to give the same result as
  model->iter_nth_child(iter, parent, 0 /* n */)

Are these actually equivalent? Is there any reason for the vfunc 
implementation to be duplicated in custom TreeModels, or can one 
just call the other?

-- 
Murray Cumming
www.murrayc.com
murrayc murrayc com