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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: flyspell bug
Date: Tue, 04 Oct 2005 23:32:52 -0400
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    > I think it would be extremely confusing if switching windows to look
    > around in another buffer were likely to run some Lisp code.

    How would you notice if flyspell did some "behind the scenes" 
    dictionary setup ?

It might cause a lot of trouble if it had a bug of some kind, or if it
did things with processes at a time you did not expect.

Anyway, my intuition, based on many years of programming, says
that it is a bad idea for switching buffers to run a hook.