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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Please try Pmail
Date: Tue, 20 Jan 2009 18:00:52 -0500
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Cc: cyd@stupidchicken.com, emacs-devel@gnu.org
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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In-reply-to: <jwviqoah92u.fsf-monnier+emacs@gnu.org> (message from Stefan
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Xref: news.gmane.org gmane.emacs.devel:108020
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    > The `widen' is necessary because pmail-view-buffer, which contains the
    > swapped-out buffer contents, is narrowed to the current message.

    So Pmail displays the messages directly from the raw mbox buffer?

No it doesn't.  (If it did, it would need only one buffer.)
But it does, apparently, do narrowing in the buffer that holds
the file.