void gtk_tree_model_filter_clear_cache ( GtkTreeModelFilter* filter )
This function should almost never be called. It clears the
of any cached iterators that haven’t been reffed with
gtk_tree_model_ref_node(). This might be useful if the child model
being filtered is static (and doesn’t change often) and there has been
a lot of unreffed access to nodes. As a side effect of this function,
all unreffed iters will be invalid.