GNU bug report logs - #50519
28.0.50; describe-fontset bug when indent-tabs-mode is nil

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

From: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; describe-fontset bug when indent-tabs-mode is nil
Date: Sat, 11 Sep 2021 16:17:04 +0200

Hi,

Unless I'm bisecting this wrong, 2021-08-20 "Fix printing of C-@ in
`describe-fontset'" (ac2cecbd83) introduced a regression when
indent-tabs-mode is nil:

$ emacs -Q
M-: (custom-set-variables '(indent-tabs-mode nil))
M-x describe-fontset RET fontset-default RET

⇒ print-fontset-element: Args out of range: #<buffer *Help*>, 1465, 1466

IIUC setting indent-tabs-mode to nil changes describe-vector's output
(since it eventually calls Findent_to), which I guess fools
print-fontset-element?

I haven't taken the time to fully understand how print-fontset-element
and mule--kbd-at operate, so I don't know if the correct fix would be
tweaking some regexp(s) or let-binding indent-tabs-mode to t somewhere.


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)
 of 2021-08-23 built on amdahl30
Repository revision: 00edc8329a6277f2e5b5204efbe503e2b7957006
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: openSUSE Tumbleweed

Configured using:
 'configure --with-xwidgets --with-cairo --with-gconf'

Configured features:
ACL CAIRO DBUS FREETYPE GCONF GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix

Message #8 received at 50519 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
Cc: 50519 <at> debbugs.gnu.org
Subject: Re: bug#50519: 28.0.50; describe-fontset bug when indent-tabs-mode
 is nil
Date: Mon, 13 Sep 2021 09:40:35 +0200

Kévin Le Gouguec <kevin.legouguec <at> gmail.com> writes:

> $ emacs -Q
> M-: (custom-set-variables '(indent-tabs-mode nil))
> M-x describe-fontset RET fontset-default RET
>
> ⇒ print-fontset-element: Args out of range: #<buffer *Help*>, 1465, 1466

Yup, this should be fixed now.

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

Message #13 received at 50519 <at> debbugs.gnu.org (full text, mbox):

From: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 50519 <at> debbugs.gnu.org
Subject: Re: bug#50519: 28.0.50; describe-fontset bug when indent-tabs-mode
 is nil
Date: Mon, 13 Sep 2021 10:36:30 +0200

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

> Yup, this should be fixed now.

Confirmed, thanks!

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