GNU bug report logs - #78673
outline-revert-buffer-restore-visibility modifies visibility

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#78673: closed (Re: bug#78665: 31.0.50; Very slow saves)
Date: Wed, 04 Jun 2025 20:41:03 +0000

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Your bug report

#78673: outline-revert-buffer-restore-visibility modifies visibility

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 78673 <at> debbugs.gnu.org.

-- 
78673: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=78673
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Juri Linkov <juri <at> linkov.net>
Cc: 78673-done <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Jonas Bernoulli <jonas <at> bernoul.li>, 78665-done <at> debbugs.gnu.org
Subject: Re: bug#78665: 31.0.50; Very slow saves
Date: Wed, 04 Jun 2025 16:40:36 -0400

> I've completed testing your patch and found no problems.

Thanks, pushed to `master`,


        Stefan

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: outline-revert-buffer-restore-visibility modifies visibility
Date: Mon, 02 Jun 2025 14:13:02 -0400

Package: Emacs
Version: 31.0.50


While playing in bug#78665 I noticed the following bug:

    src/emacs -Q lisp/transient.el -f outline-minor-mode
    M-: (hide-sublevels 1000) RET
    M-: (funcall (outline-revert-buffer-restore-visibility)) RET

Notice that after the first `M-:` all the definitions' first lines are
visible (and their bodies are hidden), whereas after the second `M-:`
only the `;;;` headings are visible and none of the actual code.
This seems to be due to the design of this save&restore code which
presumes that all the hiding is applied always to whole subtrees.


        Stefan

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