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- Backtrack arrays are stored in reverse buffer order per OT spec - Reverse before matching so backtrack[0] aligns with position before input
- Skip marks not in the lookup's filtering set per OT spec - Overrides ignoreMarks and markAttachmentType for marks
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October 18, 2026 16:15
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Marks outside a lookup's filtering set must be skipped during iteration per the OT spec —
useMarkFilteringSetoverrides bothignoreMarksandmarkAttachmentTypefor marks. Without honouring it, contextual rules either fail to fire or fire on the wrong context, and mark-to-mark positioning attaches to the wrong candidate.The lookup's filtering set is resolved lazily into a
Set<glyphId>(cached per Coverage), threaded throughGlyphIterator.reset, and checked inshouldIgnorebefore the legacy mark-skipping flags.Test note
The added Mada test exercises an
rcltchain whose backtrack also depends on #372 (chain-context backtrack matching order). This branch is therefore stacked on #372 and includes its commit; please merge #372 first, after which only this PR's own commit remains.