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/
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