def compute_diff_handle(filename, old_line, code):
        """Uses the absolute line and ignores the callable/character offsets.
        Used only in determining whether new issues are old issues.
        """
        key = "{filename}:{old_line}:{code}".format(
            filename=filename, old_line=old_line, code=code
        )
        return BaseParser.compute_handle_from_key(key)