gtk/gtk.go
func (v *TreeModel) FilterNew(root *TreePath) (*TreeModelFilter, error) {
	c := C.gtk_tree_model_filter_new(v.native(), root.native())
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapTreeModelFilter(obj), nil
}
func (v *TreeModel) FilterNew(root *TreePath) (*TreeModelFilter, error) {
	c := C.gtk_tree_model_filter_new(v.native(), root.native())
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapTreeModelFilter(obj), nil
}
// FilterNew is a wrapper around gtk_tree_model_filter_new().