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From: Colin Walters <walters@gnu.org>
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Subject: Re: overlay debugging
Date: 05 Jun 2002 14:46:10 -0400
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On Wed, 2002-06-05 at 05:18, Alex Schroeder wrote:

> When I want to check why a given character in a given buffer looks and
> acts the way it does, I like to use M-x list-text-properties.  What I
> like about it is the list of all text-properties used and their
> values.  Now if the information I want is in overlays, I cannot get to
> it.  I must use M-: (setq o (overlays-at (point))) switch to the
> scratch buffer and test some of the properties myself explicitly,
> there is no way to "just list" them.

Does the function `describe-text-at' do what you want?