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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: should search ring contain duplicates?
Date: Tue, 16 May 2006 00:29:35 -0400
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    > More precisely, it does not preserve the old head.
    > Instead it deletes that and then adds a new element.
    > But the result is, all the same, to have just one, not two.
    > This is all that matters, as far as I can see.

    It depends on the setting of history-delete-duplicates, whereas
    the code in read-from-minibuffer does not.

Ok, now I see the issue.

    The following version of add-to-history which obeys the same rules
    as read-from-minibuffer, including the keep-all arg.

Thanks, and please install it.
Please update the Lisp Manual and etc/NEWS, too.

Thanks.