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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Ctrl-[ ?
Date: Mon, 10 Jun 2019 19:42:55 +0300
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To: Stefan Kangas <stefan@marxist.se>
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 (message from Stefan Kangas on Mon, 10 Jun 2019 02:23:43 +0200)
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> From: Stefan Kangas <stefan@marxist.se>
> Date: Mon, 10 Jun 2019 02:23:43 +0200
> 
> Would it make sense to show a warning when trying to bind keys such as
> C-[ or C-i?

Most key bindings are done non-interactively, so how would such
warnings work in practice?

> C-h k C-[ only shows "ESC- " when I try, though.)

That's because the translation is in effect.

> Would it make sense to introduce a variable to turn this behaviour off
> in a graphical environment?

To turn off what behavior?