bug#30059: 25.3; Wrong value for comint-process-echoes will cause comint-send-input to hang

[Lars Ingebrigtsen]

Richard Sharman <rsharman@pobox.com> writes:

> I’ve been hit by this a few times and it’s quite annoying.  Starting
> from emacs -Q evaluate the following 2 lines
>
> (setq comint-process-echoes t)
> (shell)
>
> then at the shell command enter “cat -n” .  This completely locks up
> emacs (at least under macos 10.13); control-G and control-C have no
> effect; the emacs process has to be killed.

I can reproduce this in Emacs 27.1, but `C-g' works fine in Emacs 28 (at
least in Debian).

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   bloggy blog: http://lars.ingebrigtsen.no