GNU bug report logs - #50785
28.0.50; error doesn't use help-key-binding face from substitute-command-keys

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Package: emacs; Severity: minor; Reported by: Stefan Kangas <stefan@HIDDEN>; dated Fri, 24 Sep 2021 18:34:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#50785: 28.0.50; error doesn't use help-key-binding face
 from substitute-command-keys
References: <CADwFkmmDDUedcLyP_-FFAsGzTxH4Xj=k_=RJvwZ+KrJD_6_5eg@HIDDEN>
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 Content preview:  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 disp [...] 
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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




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#50785; Package emacs. Full text available.

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Subject: 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.




Acknowledgement sent to Stefan Kangas <stefan@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#50785; Package emacs. Full text available.
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