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Problem: Deciding whether a group is in a "contains"/cluster list scans
the list and expands clusters on every check, which is slow for
syntaxes with large lists (e.g. plugins such as netrw).
Solution: Resolve each list once into a sorted, cluster-expanded set of
group IDs and use a binary search; cache it per syntax block and
drop the cache when syntax definitions change (Hirohito Higashi).
closes: vim/vim#20490
48fbae4378
Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>