[Dev-luatex] Fonts used for luatex discretionaries

David Carlisle d.p.carlisle at gmail.com
Sat Jul 30 17:14:15 CEST 2022

On Sat, 30 Jul 2022 at 10:37, Hans Hagen <j.hagen at xs4all.nl> wrote:
> On 7/29/2022 9:39 PM, David Carlisle wrote:
> > Normally a hyphen inserted at a line break comes from the font used for
> > the current word.
> >
> > If the luatex extended {before}{after}{nobreak} syntax is used in
> > \hyphenation the same is true unless the nobreak field is empty in which
> > case the font from (I think) the end of the paragraph is used.
> >
> > This is LuaTeX, Version 1.15.0 (TeX Live 2022)
> >
> > You can work around the issue by repeating the following character so
> >
> > {-}{w}{w} instead of {-}{}{}w
> >
> > in the attached example, but this seems wrong?
> works ok in luametatex where it uses the wordstart font so i'll see if i
> can backport that bit (the language code is quite different so i need to
> check carefully)
> Hans

Hans, thanks.

Mostly this started from a latex user on stackexchange, I was just
removing latex idioms to report here.

This seems to be a possibly related issue, why in the first example
here, does the "i" which is not in a discretionary get dropped?


X\hskip 400pt Abstraktionsebene

X\hskip 420pt Abstraktionsebene


This seems similar to this example in the luatex manual (texlive 2022
version, last table in section 5.4).



123 zzzzzz 123


the final z, the word space and the 1 at the start of the next word
all get dropped so the text ends -b23 which matches the manual but I
suspect is wrong?


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