Re: em-dash ligature is converted to en-dash in the generic fontloader

From: Hans Hagen <j.hagen@xs4all.nl>
To: "Marcel Krüger" <tex@2krueger.de>,
	"ntg-context@ntg.nl >> mailing list for ConTeXt users"
	<ntg-context@ntg.nl>
Subject: Re: em-dash ligature is converted to en-dash in the generic fontloader
Date: Fri, 1 Mar 2019 13:09:25 +0100	[thread overview]
Message-ID: <ffc2b2fd-383a-3670-11b8-76601742115d@xs4all.nl> (raw)
In-Reply-To: <16939047e5a.1251b699146641.1181620700647014570@2krueger.de>

On 3/1/2019 12:29 PM, Marcel Krüger wrote:
>   ---- On Fri, 01 Mar 2019 11:17:56 +0100 Hans Hagen <j.hagen@xs4all.nl> wrote ----
>   > On 2/28/2019 12:38 PM, Marcel Kr&uuml;ger wrote:
>   > > On 2/23/2019 1:50 PM, Ulrike Fischer wrote:
>   > >> As reported on the dev-luatex list --- is converted to an en-dash
>   > >> (instead of em-dash) if there are no spaces around the ---.
>   > >>
>   > >> We could now reproduce the problem also with the generic fontloader:
>   > >> it appears only with mode=node. I'm using the files from 2019-02-14,
>   > >> but the problem appeared first in the files from 2018-11-18):
>   > >>
>   > >> \font\test={file:texgyreheros-regular.otf:+tlig;mode=node;}\test
>   > >>
>   > >> dashes-these % gives dash
>   > >>
>   > >> dashes--these % gives en-dash
>   > >>
>   > >> dashes---these % gives en-dash WRONG
>   > >>
>   > >> dashes --- these % gives em-dash
>   > >>
>   > >> em-dashes---these % gives em-dash
>   > >>
>   > >> \bye
>   > >>
>   > >> context is not affected, there the code works fine.
>   > >
>   > > This issue can be fixed in the fontloader with the attached patch.
>   > Hm, I don't see those lines here and it looks ok in context so ... no
> 
> For reproduction in context, the code
> 
>      \starttext
>      ff\discretionary{l}{}{l}
>      \stoptext
> 
> currently produces a single `fl` ligature instead of `ffl`.
> 
> Interesting that you didn't see those lines, maybe we have different versions?
> The patched line is line 844 in the file `font-ots.lua` of ConTeXt beta, updated today.
your patch referred to other numbers

i'll look into it (also why it is as it is)

thanks for the example

Hans

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