2002-05-10  Daniel Elstner  <daniel.elstner@gmx.net>

[ merge from stable ]

* gtk/gtktreemodel.c: #define INITIALIZE_TREE_ITER(), which zeroes out all GtkTreeIter fields. (#81380)
(gtk_tree_model_get_iter): Use it.
(gtk_tree_model_iter_children): ditto
(gtk_tree_model_iter_nth_child): ditto
(gtk_tree_model_iter_parent): ditto