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Subject: bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
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Severity: minor

In "emacs -Q", if I use the following function:

(defun foo ()
  (interactive)
  (error (substitute-command-keys "Use \\[next-line]")))

The error message says "Use C-n", but "C-n" is not displayed with the
`help-key-binding' face.

In contrast, `message' does not have this problem:

(defun foo2 ()
  (interactive)
  (message (substitute-command-keys "Use \\[next-line]")))

Here, "C-n" is displayed with the correct face.

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To: Stefan Kangas <stefan@HIDDEN>
Subject: bug#50785: Acknowledgement (28.0.50; error doesn't use
 help-key-binding face from substitute-command-keys)
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Subject: bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Sat, 25 Sep 2021 04:03:36 +0200
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 (Stefan Kangas's message of "Fri, 24 Sep 2021 11:33:35 -0700")
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Stefan Kangas <stefan@HIDDEN> writes:

> In "emacs -Q", if I use the following function:
>
> (defun foo ()
>   (interactive)
>   (error (substitute-command-keys "Use \\[next-line]")))
>
> The error message says "Use C-n", but "C-n" is not displayed with the
> `help-key-binding' face.

Hm...  is `error' stripping text properties before displaying, by any
chance?  If so, is there any particular reason why that would make sense
in general?  Hm...  perhaps the idea is that `error' is used in
low-level circumstances, so we don't want to rely on faces etc actually
working?

Anybody know?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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