Re: [vim/vim] undo result looks wrong after substitution with "\r" and gc flag (#4798)

Henré Botha (Vim Github Repository) <[email protected]>
Newsgroups gmane.editors.vim.devel
Message-ID <vim/vim/issues/4798/[email protected]>
henrebotha left a comment (vim/vim#4798)

This bug still exists on Vim 9.1.

I can reproduce it with `vim --clean -u test.vim`.

`test.vim`:

```
set nocompatible

norm IAbout this bug reproduction script: This script will run a `:s` substitution command with the `c` flag. Your UI might be a little broken while it waits for you to confirm each substitution. When you see this text, simply press `y` followed by Enter to accept each substitution in turn. This is necessary in order to reproduce the bug. Afterwards, it will run `:norm u` to undo the most recent change. NOTE HOW, AFTER THE UNDO, SOME OF THIS TEXT IS DUPLICATED. THAT IS THE BUG.

s/\v\. +/.\r/gc

norm u
```

To emphasise what the script says: The undo is resulting in duplicated text.

- The error only occurs with `set nocompatible`.
- The error does not occur if you press `a` at the first substitution prompt. You have to accept suggestions to reproduce.

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