On Sun, Apr 29, 2012 at 16:46, Stefan Monnier <monnier@iro.umontreal.ca>wrote:

> >    (defun isearch-cycle-search-invisible ()
> >      "Cycle the value of `search-invisible'.
> >    Bound to \\<isearch-mode-map>\\[isearch-cycle-search-invisible] in
> `isearch'."
> >      (interactive)
> >      (setq search-invisible
> >            (case search-invisible
> >              ((nil) t)
> >              ((t)   'open)
> >              (else  nil)))
>
> I personally find the "search within hidden text without opening it" to
> be a completely useless option, so I couldn't want to cycle between all
> 3 options, but only between nil and `open'.
>
> >    (define-key isearch-mode-map [?\M-i]
> >           'isearch-cycle-search-invisible)
>
> You'll have to place it in the M-s prefix map instead, which was setup
> specifically to avoid eating up more key combinations which currently
> make isearch exit.
>
> > So, it would be good if the user could change the value of
> > `search-invisible' as well directly from isearch.
>
> I'm not sure I'd find it useful, but I can imagine some people might
> like it and there's plenty of room under the M-s prefix for such
> a thing.
>
> It is in my opinion very useful in org-mode.