Returns full html line for single changeset per annotated line.

def annotate_from_changeset(self, changeset):
        """
        Returns full html line for single changeset per annotated line.
        """
        if self.annotate_from_changeset_func:
            return self.annotate_from_changeset_func(changeset)
        else:
            return ''.join((changeset.id, '\n'))