Setting the author header changes the Creator metadata field

Coco Liliace via bug-lilypond <[email protected]> Fri, 28 Mar 2025 13:29:41 +0800

Newsgroups	gmane.comp.gnu.lilypond.bugs
Message-ID	<[email protected]>

Setting the author header in a document changes the Creator metadata
field in the generated pdf to the author.

I would like to set the author field while keeping the default creator
value: LilyPond {version}.

Reproducible example:
```ly
\version "2.25.24"

\header {
	author = "Me"
}

\fixed c {
	c
}
```

exiftool shows that both the Author and Creator are set to "Me".
The expected behaviour should be that the Author is set to "Me" and
Creator defaults to "LilyPond 2.25.24" as it should be unaffected by the
author header.
lilypond of the same version)

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