Ligatures display incorrectly for "fi" when cv06 enabled
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- Clojure
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Description
When I enabled cv06 in the build, it displayed character "i" incorrectly in the combo "fi" despite the choice of ss10, but trivial "i" or other combos are correct.
Please see the example in the following picture.

The font was built with docker by the following command:
docker run --rm -v "$PWD":/opt tonsky/firacode:latest ./script/build.sh -f "cv01,cv02,cv06,ss01,ss05,ss04,ss03,cv
30,ss08,ss09,cv25,cv26,cv32,cv28,ss06,ss07"
A newfound: this issue happens in the kitty terminal and Windows terminal I used but doesn't seem to be a problem in the terminal in VSCode. Note that I have ligatures enabled in all of those terminals.
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First steps
- Read the whole issue, then the project's contributing guide.
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Research direction
Reproduce the font with the provided Docker command and script/build.sh, then compare the “fi” rendering with cv06 and ss10 enabled in kitty and Windows Terminal against VSCode. Done means the “i” renders correctly in the “fi” ligature without regressing standalone “i” or the other combinations.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker
- Domain
- design
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100