def METHOD_NAME(self, renderer=None):
    path_in_disp = self._line_transform.transform_path(self._line_path)
    mutation_size = self.get_mutation_scale()  # line_mutation_scale()
    extended_path = self._extend_path(path_in_disp,
                                      mutation_size=mutation_size)
    self._path_original = extended_path
    return FancyArrowPatch.METHOD_NAME(self, renderer)