[vim/vim] Wrong cursor position with 'linebreak' and large 'tabstop' (PR #21418)

[zeertzjq]

What does this change do?

Before (cursor on 'r'):

TODO

After (cursor on 'r'):

TODO

Commit message

Problem: Wrong cursor position with 'linebreak' and large 'tabstop'.
Solution: Avoid "colmax" becoming smaller than the whitespace char's
final column (zeertzjq).

AI assistance

• 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
• No documentation update is needed

---

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

  https://github.com/vim/vim/pull/21418

Commit Summary

• e54e8dd Wrong cursor position with 'linebreak' and large 'tabstop'

File Changes

(2 files)

• M src/charset.c (2)
• M src/testdir/test_listlbr.vim (16)

Patch Links:

• https://github.com/vim/vim/pull/21418.patch
• https://github.com/vim/vim/pull/21418.diff

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