    def max_height(self):
        """
        :return: The max height of the rendered text (across all images if an animated renderer).
        """
        if len(self._plain_images) <= 0:
            self._convert_images()

        if self._max_height == 0:
            for image in self._plain_images:
                self._max_height = max(len(image), self._max_height)
        return self._max_height
:return: The max height of the rendered text (across all images if an animated renderer).
asciimatics/renderers/base.py