Removes current highlighter.

        :return: Method success.
        :rtype: bool

def remove_highlighter(self):
        """
        Removes current highlighter.

        :return: Method success.
        :rtype: bool
        """

        if self.__highlighter:
            LOGGER.debug("> Removing '{0}' highlighter.".format(self.__highlighter))
            self.__highlighter.deleteLater()
            self.__highlighter = None
        return True