Re: subtle bug in generating PDF outlines with luatex

[Werner LEMBERG]

>> So: can this be fixed on the side of `texinfo.tex` at least for the
>> space character, circumventing the luatex bug for the most common
>> case?
>
> I have minimal understanding of lua and luatex.  I've edited
> texinfo.tex in the obvious way: [...]
>
> Is there any testing you can do of this to confirm it works as
> expected before I commit it?

Yes, I tested it by simply rebuilding the LilyPond documentation (from
current git); `gs` gets used as a post-processor if the
`extractpdfmark` utility is installed.

Alas, your patch doesn't fix the issue; I get the same bad result
(i.e., missing entries in the outline) as before.  Apparently it is
important that the space character gets protected.

I guess we have to wait until Luigi has corrected this problem in
luatex.

Luigi, Masamichi-san, can you confirm, please?  Gavin's patch can be
found here:

  https://lists.gnu.org/archive/html/bug-texinfo/2025-01/msg00049.html

If I'm right it maybe makes sense to add a small note to Texinfo,
mentioning that you need a luatex version XXXX or newer to get correct
outlines.



    Werner