In the long term, we might want to make a different low-level API for building ChainContextPos lookups; for now, this should fix the current bug with SequenceIndex. Resolves https://github.com/behdad/fonttools/issues/517.
In the long term, we might want to make a different low-level API for building ChainContextPos lookups; for now, this should fix the current bug with SequenceIndex. Resolves https://github.com/behdad/fonttools/issues/517.