Comment 7 for bug 1922654

I have tried to apply debdiff for maven_focal.debdiff[1]

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$ debdiff-apply < ../maven_focal.debdiff
Traceback (most recent call last):
  File "/usr/bin/debdiff-apply", line 382, in <module>
    sys.exit(main(sys.argv[1:]))
             ^^^^^^^^^^^^^^^^^^
  File "/usr/bin/debdiff-apply", line 312, in main
    patch = unidiff.PatchSet(data.splitlines(keepends=True), encoding=enc)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/unidiff/patch.py", line 460, in __init__
    self._parse(data, encoding=encoding, metadata_only=metadata_only)
  File "/usr/lib/python3/dist-packages/unidiff/patch.py", line 548, in _parse
    current_file._parse_hunk(line, diff, encoding, metadata_only)
  File "/usr/lib/python3/dist-packages/unidiff/patch.py", line 316, in _parse_hunk
    raise UnidiffParseError(
unidiff.errors.UnidiffParseError: Hunk diff line expected: diff -Nru maven-3.6.3/debian/control maven-3.6.3/debian/control

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[1] https://bugs.launchpad.net/ubuntu/+source/maven/+bug/1922654/+attachment/5697379/+files/maven_focal.debdiff