bug#34318: 26.1.90; Strange behavior of two line message with running shell

[Eli Zaretskii]

On February 5, 2019 10:36:35 AM GMT+02:00, martin rudalics <rudalics@gmx.at> 
wrote:
>  > For me, with no shell involved, in emacs-26 but not master:
>  >
>  > emacs -Q
>  >
>  > Type in scratch:
>  >
>  > (message "1\n2")
>  >
>  > Press C-x C-e
>  >
>  > -> two line message
>  >
>  > Now type:
>  >
>  > M-: (message "1\n2")
>  >
>  > -> one line message "1\n2".
>  >
>  > Now repeating C-x C-e on the original expression in scratch also
>  > produces a one line message, forever more.
> 
> Ahh...  This is a correct and considerably simpler scenario than the
> one I provided.  Hence anyone investigating this issue, please stick
> to Glenn's scenario.
> 
> Many thanks, martin

Repeat the same recipe in "emacs -Q", after typing "C-x 4 C-o RET", which 
should show "*Messages*" in another window without selecting that window.  Look 
at what "*Messages*" shows after each evaluation.  Does the behavior still look 
strange?  Any questions left?