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Support the Remove Features instance parameter - #1216
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anthrotype
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Thanks!
One minor gap which we may (or not?) wish to handle here as well: the features that ufo2ft's feature writers generate are not yet in the feature text by the time this runs, so with Remove Features = ["kern"] and some kerning, the instance still comes out with a kern feature, whereas a native Glyphs 3.5 export has none. I'd expect the same for the other generated features (mark, mkmk, curs, dist).
Maybe the handler could also restrict the feature writers in the instance UFO's lib. Each writer takes a features option, so e.g. {"class": "KernFeatureWriter", "options": {"features": ["dist"]}} drops kern (I tried that). A writer left with no features would have to be removed from the list, since ufo2ft rejects an empty one.
Glyphs also applies "Remove Features" to variable font exports, while here it's lost just as "Replace Feature" already is (fine to leave that for later).
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Done! The handler now also restricts the feature writers in the UFO lib (falling back to the default writers), dropping any writer left without features. Added a test that runs the writers and checks no |
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An instance's "Remove Features" parameter (a list of feature tags) is not applied today. This removes those features' blocks from the instance's feature code, along with their
feature xxxx;references in other features such as aalt, following the existing "Replace Feature" handler.Glyphs that only the removed features reach are left in the font; dropping them is left to the subsetter.