bug#61024: 29.0.60; [PATCH] Eshell errors out when trying to redirect output of a remote process

[Eli Zaretskii]

> Date: Sun, 22 Jan 2023 23:07:58 -0800
> From: Jim Porter <jporterbugs@gmail.com>
> 
>    ~ $ cd /sudo::
>    /sudo:root@host:~ # *echo hi there > #<foo>
>    Wrong type argument: "bufferp echo-stderr"
> 
> (Any other Tramp method should reproduce this issue.) That's because the 
> echo command is being redirected to two places: stdout is going to the 
> buffer "foo", and stderr is going to the Eshell buffer (via a pipe 
> process). However, that doesn't work for Tramp processes.
> 
> Attached is a fix with a test. I think this should definitely go in 
> Emacs 29, since it's a pretty bad regression.

Fine by me, unless Michael objects or has better ideas.

> I'm actually surprised no one has filed a bug on this already.

Maybe it tells us how many people use this combination?