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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Yanking wrong text
Date: Sun, 24 Jun 2007 10:40:50 -0400
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References: <87d4znvh7h.fsf@jurta.org> <jwvodj7xpm5.fsf-monnier+emacs@gnu.org>
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvps3mse71.fsf-monnier+emacs@gnu.org> (message from Stefan
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    I think the key is to check not just whether the two strings are equal, but
    also whether the head of the kill-ring really comes from the currently
    active region.  E.g. check that last-command is one that uses
    copy-region-as-kill.

It might work.  Would you like to try implementing that?