[vim/vim] substitute: wrong text after undo of a confirmed replacement with "\r" (PR #21092)

```
Problem:  When a substitution is confirmed with the "c" flag and the
          replacement contains "\r", undo restores the whole original line
          while the lines already produced by earlier replacements stay,
          duplicating text.
Solution: Replace the line before the next confirmation prompt, so that the
          line split and the replacement it belongs to end up in the same
          undo block.
```

fixes: #4798
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21092

-- Commit Summary --

  * substitute: wrong text after undo of a confirmed replacement with "\r"

-- File Changes --

    M src/ex_cmds.c (6)
    M src/testdir/test_substitute.vim (23)

-- Patch Links --

https://github.com/vim/vim/pull/21092.patch
https://github.com/vim/vim/pull/21092.diff

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