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

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. -- Ulrike Fischer https://www.troubleshooting-tex.de/