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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: query-replace in isearch (was Re: should search ring contain
	duplicates?)
Date: Sun, 14 May 2006 11:09:51 -0400
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    >                                                         Using
    > add-to-history will treat this new element just like other new
    > elements on the same history list.  That seems right to me.  Do you
    > think it is wrong in this case?

    It is wrong if history-delete-duplicates is nil; then it unconditionally
    adds an element even if it is equal to the head of the history.

If history-delete-duplicates is nil, why is that behavior wrong?
Isn't it normal, in that case, to add the new element unconditionally?