Add new checks for languagesystem DFLT dflt in UFO sources. #4247
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Description
This adds a new check that tests for the presence of a
languagesystem DFLT dflt
statement in UFO feature files. If a feature file contains nolanguagesystem
statements the compiler will automatically insert one, but will not do so if there is anotherlanguagesystem
statement present (which may or not be theDFLT dflt
). Warn in this case as it may lead to unexpected side effects (such as OT features not working for the default language).Fixes #4011
Checklist
CHANGELOG.md