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Problem: In diff mode with 'cursorbind' the cursor in the other window is
not updated after an undo that changes which lines correspond.
Solution: Also check whether the text changed before skipping the update
(Hirohito Higashi).
fixes: vim/vim#20982
related: vim/vim#13219
related: vim/vim#13210
closes: vim/vim#21004
2045a20d4b
Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>