vim-patch:9.2.0647: matchfuzzypos() false exact match for long equal-length candidates (#40257)

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

Example:
echo matchfuzzypos(['x' .. repeat('a',1024)], repeat('a',1024))

closes: vim/vim#20475

https://github.com/vim/vim/commit/1437f478158e71effdbcec3df5caa95af9b9a50a

Co-authored-by: glepnir <glephunter@gmail.com>

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