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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: master d94ab49: Fix bootstrap after recent undo-redo change
Date: Thu, 30 Sep 2021 14:41:48 +0300
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To: Dmitry Gutov <dgutov@yandex.ru>
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 Dmitry Gutov on Thu, 30 Sep 2021 14:04:28 +0300)
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> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 30 Sep 2021 14:04:28 +0300
> 
> On 30.09.2021 07:59, Lars Ingebrigtsen wrote:
> > -(define-key global-map (kbd "C-?") 'undo-redo)
> > +(define-key global-map "\C-?" 'undo-redo)
> 
> Sorry about the breakage.
> 
> But "\C-?" and (kbd "C-?") are not the same: the former evaluates to a 
> string containing the DEL char.
> 
> The latter returns something like [67108927], and that's how we avoided 
> trying to bind 'undo-redo' to Backspace. This binding only works in GUI 
> Emacs, of course.

Right.  I tried to fix this, please test.