def rfc822_unescape(content: str) -> str:
    """Reverse RFC-822 escaping by removing leading whitespaces from content."""
    lines = content.splitlines()
    if len(lines) == 1:
        return lines[0].lstrip()
    return '\n'.join((lines[0].lstrip(), textwrap.dedent('\n'.join(lines[1:]))))
Reverse RFC-822 escaping by removing leading whitespaces from content.
product/gradle-plugin/src/main/python/setuptools/_core_metadata.py