bug#8023: Why can't one run more than one dired-do-async-shell-command at once?

[Juri Linkov]

> Why can't one run more than one dired-do-async-shell-command at the same
> time?
>
> Why not allow more than one?
>
>   shell-command: Shell command in progress
>
> What if bash was also that way?
>
> If it is a matter of what buffers it is writing to, then append their
> names with <2> etc. or a process ID.

We have planned to add an option to control the creation of multiple
output buffers for `async-shell-command'.  The question is in its
default value.  Maybe it should ask a question: "Create a new buffer?"

Or better would be to ask for a new buffer name:

  Async shell buffer (default *Async shell*<2>):

like `C-u M-x shell RET' already does:

  Shell buffer (default *shell*<2>):