Return a get_content generator for unread messages.

        :param unset_has_mail: When True, clear the has_mail flag (orangered)
            for the user.
        :param update_user: If both `unset_has_mail` and `update user` is True,
            set the `has_mail` attribute of the logged-in user to False.

        The additional parameters are passed directly into
        :meth:`.get_content`. Note: the `url` parameter cannot be altered.

def get_unread(self, unset_has_mail=False, update_user=False, *args,
                   **kwargs):
        """Return a get_content generator for unread messages.

        :param unset_has_mail: When True, clear the has_mail flag (orangered)
            for the user.
        :param update_user: If both `unset_has_mail` and `update user` is True,
            set the `has_mail` attribute of the logged-in user to False.

        The additional parameters are passed directly into
        :meth:`.get_content`. Note: the `url` parameter cannot be altered.

        """
        params = kwargs.setdefault('params', {})
        if unset_has_mail:
            params['mark'] = 'true'
            if update_user:  # Update the user object
                # Use setattr to avoid pylint error
                setattr(self.user, 'has_mail', False)
        return self.get_content(self.config['unread'], *args, **kwargs)