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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: how to control isearch for invisible text
Date: Sun, 13 Aug 2006 13:52:59 -0400
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    > I think `occur' always makes things visible because it copies text
    > and overlays are not copied along, so the invisibility gets lost.  I
    > do think query-replace should be improved to open invisible text
    > just like isearch does.

I agree that query-replace should show invisible text
when a match occurs inside it.

Would someone like to implement that?

What is `preview-open-overlays'?  It is not part of Emacs.