bug#58503: 29.0.50; eshell, with remote pwd, diff between folders doesn't create a *Diff* buffer

[Stefan Kangas]

miha@kamnitnik.top writes:

> Steps to reproduce:
>
> M-x eshell
> cd into a remote directory, for example 'cd /sudo::~/'
> compare two existing folders with 'diff a/ b/' or 'diff -r a/ b/'
>
> Eshell prints diff output into the *eshell* buffer instead of displaying
> a *Diff* buffer. This isn't an issue in a local pwd.

Copying in Michael in case he has any comments.