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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Recent keyboard changes breaks quitting
Date: Sat, 22 Sep 2012 22:27:55 +0300
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To: Chong Yidong <cyd@gnu.org>
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> From: Chong Yidong <cyd@gnu.org>
> Date: Sun, 23 Sep 2012 01:35:31 +0800
> Cc: emacs-devel@gnu.org
> 
> Interestingly, the bug disappears if I remove Fcopy_sequence from
> 
>      idle_timers = Fcopy_sequence (Vtimer_idle_list);

Is it possible that the call to timer-event-handler, which modifies
the timer (via cancel-timer-internal) and the timer list, interacts
badly with the copied timer list, because Fcopy_alist doesn't copy the
list elements?  If so, perhaps making a deep copy of the list will fix
the problem?