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From: Richard Stallman <rms@gnu.org>
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Subject: Re: overlay-start > overlay-end
Date: Mon, 22 Mar 2004 22:04:55 -0500
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	(make-overlay (point) (point) (current-buffer) t)
	(insert ?x)
	(overlay-lists)))
    => ((#<overlay from 2 to 1 in *scratch*>))

Cute.

    +  /* Canonicalize the order of start and end. */
    +  if (tail)
    +    {

This fixes just one overlay.  What if there are several
such overlays?  I think it is necessary to have a loop
here, to fix as many broken overlays as there may be.