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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: Emacs Lisp manual issues regarding overlays, display properties,
	margins, etc.
Date: Mon, 01 Oct 2007 13:40:55 -0400
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To: Joe Wells <jbw@macs.hw.ac.uk>
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In-reply-to: <863awxxw80.fsf@macs.hw.ac.uk> (message from Joe Wells on Sat, 29
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    Can this please be documented?  Both that no ?priority? property (or a
    value of nil) is equivalent to a value of 0,

Ok, will do.

						 and how priority works
    for overlays with the same priority.

I am not sure which overlay wins when they have the same priority
and same span.  I think it is better not to depend on that.