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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: replace.el changes...
Date: Tue, 22 Jun 2004 19:16:58 -0400
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    If a replacement has already been done, the stored information in the
    history does not contain the highlighted region.

Could you please be more explicit?  What is "the history" that you
refer to?  Does it have a name?  Where is it documented?

    It is actually not documented to be useful, except as being nil or
    non-nil.  And even then, it is only documented for perform-replace
    itself (the internal routine doing the job).

If it is not documented, people can't complain if we change it.