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bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and comp

From: Paul Eggert
Subject: bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs'
Date: Thu, 7 Apr 2016 09:26:00 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 04/07/2016 09:07 AM, Phillip Lord wrote:
Well, I need to scope this. If the issue is tcsh and bash, then I will
look at both. I cannot, of course, look at any arbitrary program which
might be affected.

I think we'd be OK if we work with the "common" shells. But that would include zsh, whose current FAQ says the following:

  Probably the most reliable way of dealing with this is to look for
    the environment variable `$EMACS', which is set to `t' in
    Emacs' shell mode.  Putting

      [[ $EMACS = t ]] && unsetopt zle

    in your .zshrc should be sufficient.

So here it's not merely a matter of fixing zsh, it's also fixing all the users' .zshrc files that are following this (obsolescent) advice.

So far we've looked at three shells (bash, tcsh, zsh), and found compatibility issues with all three. This is not a good sign.

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