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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: `C-b' is backward-char, `left' is left-char - why?
Date: Sat, 28 May 2011 00:13:05 +0300
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> Date: Sat, 28 May 2011 00:09:31 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> > From: "Drew Adams" <drew.adams@oracle.com>
> > Date: Fri, 27 May 2011 13:40:37 -0700
> > 
> > I'm curious. Why is it a good idea that `C-b' and `left' are no longer bound to
> > the same command?
> 
> Because `left' and `right' behave differently depending on the
> bidirectional context, whereas C-f and C-b are independent of it.

And another reason: if `left' sometimes moves _forward_ in the buffer,
binding it to a command called `backward-char' is a lie.