Janneke Nieuwenhuizen writes:

Hello!

> [.]
>
>>> To reproduce, a
>>> single character (that is not '.') and a newline suffices, typing
>>> something like:
>>> 
>>>     PS1='0\n$ '
>>> 
>>> in an emacs shell and typing M-RET reproduces the problem.
>>
>> Can you suggest how to solve this?
>
> Good question!  When I tried to add (message ...) debugging this
> morning, it started (and kept) looping; so I had no idea how to proceed.
> However, I tried again and got better results this time and have created
> a patch that "works for me" (see attached).

[..]  Snip rationale that still holds...but

...initially I only used `seq-filter' in my patch, so I removed the
stripping of the optional final newline.  When I added the fall-back to
takk the last element of the list, we'd need to bring back that final
newline removal.  Version 2 attached.

Greetings,
Janneke