GNU bug report logs - #16493
24.3.50; (setq search-invisible t) is useless, let's allow to turn visible-mode temporarily on

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: bzg <at> gnu.org, 16493 <at> debbugs.gnu.org, npostavs <at> gmail.com
Subject: bug#16493: 24.3.50; (setq search-invisible t) is useless, let's allow to turn visible-mode temporarily on
Date: Tue, 30 Apr 2019 18:21:13 +0300

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Date: Tue, 30 Apr 2019 08:45:54 -0400
> Cc: Bastien <bzg <at> gnu.org>, 16493 <at> debbugs.gnu.org
> 
> You need to use `add-to-invisibility-spec` before that works.  E.g.: 
> 
>     (add-to-invisibility-spec 'dummy)
>     
> that's because of a quirk of the way we treat `invisible` and the
> `buffer-invisibility-spec`.
> 
> 
>         Stefan
>         
> 
> PS: To fix this quirk, we should change buffer-invisibility-spec's
> default value to nil (or `(t)`, maybe) instead of t.

That'd be confusing, IMO.  If we need to change some of the semantics
of buffer-invisibility-spec, I'd prefer to introduce some new form of
value which would mean "override any other invisibility properties".

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