Quoth Sebastian Tennant <sebyte@smolny.plus.com>:
> Asynchronous commands called via shell-command, for example:
>
>  (shell-command "apt-get update &")
>
> fill the buffer *Async Shell Command Output* with Ctrl-Ms, which I'm
> sure is not what's intended.
>
> My patch (attached) fixes this by using make-comint-in-buffer, rather
> than start-process, to call the asynchronous process.

Actually, this updated patch (attached) is what's required to fix the
problem here.

It explicitly puts the buffer in comint-mode.  (My last patch neglected
to do this).

Sebastian