[vim/vim] case-folded regexp matches can end inside a UTF-8 character (PR #21439)

[Volodymyr Chernetskyi]

What does this change do?

Problem: Case-folded regexp matches can end inside a UTF-8 character
when the input is longer than the literal pattern.
Solution: Return the input byte length after a successful comparison
even when it exceeds the pattern byte length, and test literal
replacements and backreferences (Volodymyr Chernetskyi).

related: #14756
related: #21212

AI assistance

• AI involvement is disclosed in the commit message, or no AI was used

Checklist

• The commit message follows the Problem/Solution form above
• Signed-off-by: trailer is present (git commit -s), recommended but not required
• Tests were added, existing tests cover the change, or the change cannot be tested (say why)
• Documentation under runtime/doc/ was updated, or no update is needed

---

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

  https://github.com/vim/vim/pull/21439

Commit Summary

• 9e83868 patch 9.2.NNNN: case-folded regexp matches can end inside a UTF-8 character

File Changes

(2 files)

• M src/regexp.c (3)
• M src/testdir/test_regexp_utf8.vim (32)

Patch Links:

• https://github.com/vim/vim/pull/21439.patch
• https://github.com/vim/vim/pull/21439.diff

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