gboolean gtk_tree_model_iter_parent ( GtkTreeModel* tree_model, GtkTreeIter* iter, GtkTreeIter* child )
iter to be the parent of
child is at the toplevel, and doesn’t have a parent, then
iter is set to an invalid iterator and
FALSE is returned.
child will remain a valid node after this function has been called.
iter will be initialized before the lookup is performed, so
iter cannot point to the same memory location.
GtkTreeIter-struct to set to the parent.
The argument will be set by the function. The data is owned by the caller of the function.
The data is owned by the caller of the function.