GNU bug report logs - #39812
26.1; face-remapping-alist is sometimes set to an unexpected value

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Package: emacs;

Reported by: Markus Triska <triska <at> metalevel.at>

Date: Thu, 27 Feb 2020 19:21:02 UTC

Severity: minor

Found in version 26.1

Fixed in version 27.1

Done: Noam Postavsky <npostavs <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Markus Triska <triska <at> metalevel.at>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 39812 <at> debbugs.gnu.org
Subject: bug#39812: 26.1; face-remapping-alist is sometimes set to an unexpected value
Date: Fri, 28 Feb 2020 08:15:03 +0100

Noam Postavsky <npostavs <at> gmail.com> writes:

> face-remap-add-relative destructively modifies the list value, so
> setting face-remapping-alist to a quoted literal gives unexpected
> results like this.

Thank you for looking into this! Using copy-tree makes it work.

However, I find it very unexpected that face remapping modifies a value
that appears as a literal constant in my own code. Is it possible to
make face remapping word without such destructive side-effects?

Alternatively, would you please consider documenting how to work around
this, for example at the place where the sample snippet is mentioned?

Thank you and all the best!
Markus
This bug report was last modified 5 years and 58 days ago.

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