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From: Dan Nicolaescu <dann@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Ubuntu 10.0: TERM=Linux: facemenu steals arrow keys
Date: Mon, 09 Jan 2012 03:48:54 -0500
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> Culprit in facemenu.el: (define-key global-map "\M-o" 'facemenu-keymap)
>
> Oh, right.  So the real problem is the use of ESC O D escape sequences.
> AFAIK these sequences aren't used any more in current
> terminal emulators.

Please try in an xterm:
emacs -nw
C-q <left>

>  I wonder how you ended up with such a situation.

The problem is that the terminal emits one escape sequence and terminfo
expects a different one.