luaotfload package in TeXLive 2016 has an interface to add new font features and replace the FeatureFile feature of
fontspec in previous versions (see the following patch: https://github.com/wspr/fontspec/commit/92fca7272dbea8df664e4739e958a8d6843c9c09 It is not in CTAN yet)
I sort of figured out how to add new ligatures (by looking through the
tlig feature in
However, what I want is to remove a certain ligature from a font. For example, some fonts, in particular those by Slimbach has a ligature for
T h, which I would like to remove. Does anyone know how to do this using the
Many thanks in advance.