On 04/25/2018 04:59 AM, Stefan Monnier wrote:
> Not sure what earlier time you're thinking of.  My minibuffer-only frame
> is still single-line, with no sign that it will grow a second line any
> time soon.
>
> In any case, I don't think this buffer-local binding is right, so
> I suggest removing it on `master`.

I vaguely recall that the minibuffer used to have problems if you did 
stuff like (read-from-minibuffer "line1\nline2"). This now works and the 
minibuffer displays as multiple lines (and does not use backslash-n in 
the display). My memory of course could be faulty.

Anyway, thanks for the second pair of eyes. I installed the attached 
into master and will close bug#31251.