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

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Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Mon, 2 Jun 2025 18:14:01 UTC

Severity: normal

Found in version 31.0.50

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

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Report forwarded to monnier <at> iro.umontreal.ca, juri <at> linkov.net, bug-gnu-emacs <at> gnu.org:
bug#78673; Package emacs. (Mon, 02 Jun 2025 18:14:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Stefan Monnier <monnier <at> iro.umontreal.ca>:
New bug report received and forwarded. Copy sent to monnier <at> iro.umontreal.ca, juri <at> linkov.net, bug-gnu-emacs <at> gnu.org. (Mon, 02 Jun 2025 18:14:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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
Reply sent to Stefan Monnier <monnier <at> iro.umontreal.ca>:
You have taken responsibility. (Wed, 04 Jun 2025 20:41:03 GMT) Full text and rfc822 format available.
Notification sent to Stefan Monnier <monnier <at> iro.umontreal.ca>:
bug acknowledged by developer. (Wed, 04 Jun 2025 20:41:03 GMT) Full text and rfc822 format available.

Message #10 received at 78673-done <at> debbugs.gnu.org (full text, mbox):

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
This bug report was last modified 1 day ago.

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