[NTG-context] em-dash ligature is converted to en-dash in the generic fontloader

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. Best regards, Marcel Krüger