Feature list is omitting features after listing some stylistic sets

[kontur]

Hey,

I've noticed with one font that some features seem to be missing and tested with a few different fonts (otf, ttf, variable font, more features, less features, only certain features). It seems something in the listing of stylistic sets is "breaking" and all features following alphabetically later are dropped from the features listing. This seems to happen during or after the listing of stylistic sets only, afaik, but oddly enough the first ssXX are listed still, but the rest of ssXX and all features after (like zero).

To have a reproducible case I am viewing this font with FontGoogles Version 1.1.4.

Stylistic sets as listed in Adobe InDesign CC 2020:

Versus the feature listing in FG:

I am wondering if the culprit has something to do with the list of ssXX after the first not defined set, e.g. this font has ss01—ss04 then has no ss05 but has ss06—and seems to omit all after ss04. Equally another font I tested has ss01 and ss02 but has no ss03 but does have ss04 and omits everything after ss02. Or maybe this is incidental.

[justvanrossum]

Thanks, sounds like a bug. I'll look into it.

[justvanrossum]

It's a bug in uharfbuzz: harfbuzz/uharfbuzz#31

[kontur]

Nifty find, and so quick 👍
Yep, looks like all three fonts I've replicated it with seem to cut off exactly after 24 feature tags, it just incidentally happens to be mid-way of the stylistic sets each time.

[justvanrossum]

Fixed in version 1.1.6.

[kontur]

Can confirm this works correctly with all fonts I encountered the problem with. Big thanks for the quick fix 👍