GNU bug report logs - #41200
Displaying a tooltip with x-show-tip gets very slow as more faces are defined

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Package: emacs;

Reported by: Clément Pit-Claudel <cpitclaudel <at> gmail.com>

Date: Tue, 12 May 2020 04:31:01 UTC

Severity: normal

Tags: moreinfo, patch

Merged with 41267

Found in version 26.3

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Noam Postavsky <npostavs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Clément Pit-Claudel <cpitclaudel <at> gmail.com>, 41200 <at> debbugs.gnu.org
Subject: bug#41200: Displaying a tooltip with x-show-tip gets very slow as more faces are defined
Date: Fri, 15 May 2020 11:33:40 -0400

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Done for frame-face-alist.  But how can one do a read-only variable?
>> Using the new variable watchers facility?
>
> At the very least mention in the doc string.  I don't think using
> watchable symbols is needed here, it sounds gross.  If there's an
> outcry that this breaks too much code out there, we could revisit
> this.

You can use make_symbol_constant to make a variable read-only.  You
could also simulate it with a variable watcher that signals an error,
but there's no sense in doing that when make_symbol_constant exists.

Neither of these makes the list object itself read-only though.
This bug report was last modified 3 years and 364 days ago.

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