backslash cannot be used in llm chat

[grota]

Hopefully this is not something stupid on my part, but I cannot seem to be able to use the backslash \ in llm chat (not in single nor in multiline mode).
Both typing interactively and pasting text have this problem; in the latter case the backslash is simply taken out.

As you can imagine this is problematic when pasting code.

The workaround is to use a literal Ctrl-v before \ then it appears, but when the prompt is long, with snippets of code, I have to open a scratch buffer in the editor and prefix each backslash with a literal Ctrl-v char which is error prone and something that in principle should not be asked to the user (in neovim you can type ctrl-v twice in insert mode).

llm prompt does not seem to have this problem.

[grota]

I figured out that the problem was the 2 readline statements for the arrow keys.
I created a PR #560 with an explicit bind for the backslash

[grota]

Also removing the existing 2 mappings works, see related #495