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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Display feature request: gud-overlay-arrow
Date: Thu, 23 Mar 2006 14:47:58 -0500
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    It would provide a safe way for code to do special things when the _user_
    switches buffers or windows or modifies a buffer.

I switch buffers often while debugging, and I don't want this to cause
anything to happen which would not otherwise have happened.