bug#71049: async-shell-command ends with "Process *Async Shell Command* finished" when remote "direct-async-process"

[Michael Albinus via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Dmitry Gutov <dmitry@gutov.dev> writes:

> Hi Michael,

Hi Dmitry,

> Either of my patches would let the user avoid having to choose between
> functionality and performance. Though I suppose some (many?) would
> prefer to disable the remote history ring altogether, for extra
> performance.

I'll have another idea.

shell-mode checks already, whether the histfile is equal
null-device. That works for the local case only.

However, in Tramp there is tramp-histfile-override. It let's you decide
whether you want to use the remote histfile, or use a histfile given by
a file name, or don't use a histfile.

This works for normal sync and async processes, but not for direct async
processes (IIRC). Let's see whether I could extend this mechanism, and
provide shell-mode proper information.

If a user sets tramp-histfile-override to t or "/dev/null", shell-mode
should not read the remote histfile. Users are already conditioned to
set this user option :-)

WDYT? I'll work on this tomorrow.

Best regards, Michael.