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From: Richard Stallman <rms@gnu.org>
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Subject: Re: `M-x customize' feature wanted: compare default and customized values
Date: Tue, 16 Jul 2002 21:04:02 -0600 (MDT)
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    Best of all would be the ability to display the two values side by side and to
    diff them visually somehow, at least at the level of are they `equal' or not
    (sometimes packages change their default to my customized value, which is now superfluous).

Want to implement it?  The "visual diff" may be hard, but the rest
should not be too hard.

    But satisfactory would be the ability to `M-x undo' the "reset to standard
    settings option"

What happens nowif you use M-x undo at that point?