union of multi-markers is broken

[dimbleby]

def test_union_broken() -> None:
    m1 = parse_marker('python_version >= "3.8" and python_version < "4.0" and sys_platform == "win32"')
    m2 = parse_marker('python_version >= "3.8" and python_version < "4.0"')

    union = m1.union(m2)
    assert str(union) == 'python_version >= "3.8" and python_version < "4.0"'

fails: the actual outcome is the same as the first marker.

[dimbleby]

@radoering this sort of thing is right up your alley, if you're interested...

[dimbleby]

broken at python-poetry/poetry-core#308, prior to which the output was ugly but correct:

python_version >= "3.8" and python_version < "4.0" and sys_platform == "win32" or python_version >= "3.8" and python_version < "4.0"

[radoering]

@dimbleby Thanks for providing the test case. Seems like an easy fix.

[github-actions]

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