def _draw_linenumber(self, posno, lineno):
        """
        Remember a line number drawable to paint later.
        """
        self._draw_text(
            self._get_linenumber_pos(posno),
            str(lineno).rjust(self.line_number_chars),
            font=self.fonts.get_font(self.line_number_bold,
                                     self.line_number_italic),
            fill=self.line_number_fg,
        )
Remember a line number drawable to paint later.