[vim/vim] matchfuzzypos() false exact match for long equal-length candidates (PR #20475)

[glepnir]

Problem: When a candidate gets truncated to MATCH_MAX_LEN and ends up the same length as the needle, the n == m shortcut would return SCORE_MAX with positions 0..n-1, even if the strings actually differ.
eg: matchfuzzypos(['x' .. repeat('a',1024)], repeat('a',1024))

Solution: Only use the shortcut if the truncated strings are truly equal. Otherwise, fall back to regular matching.

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20475

Commit Summary

• f2accce matchfuzzypos() false exact match for long equal-length candidates

File Changes

(2 files)

• M src/fuzzy.c (22)
• M src/testdir/test_matchfuzzy.vim (6)

Patch Links:

• https://github.com/vim/vim/pull/20475.patch
• https://github.com/vim/vim/pull/20475.diff

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