GNU bug report logs - #46557
28.0.50; Visual glitches in text mode when tab-bar visibility is altered at load time

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

From: Bastian Beranek <bastian.beischer <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Visual glitches in text mode when tab-bar visibility is
 altered at load time
Date: Tue, 16 Feb 2021 12:05:51 +0100

The following recipe creates a broken visual appearance of emacs in text
mode, at least on GNU/Linux:

1) Create a test.el file with these lines:

(set-frame-parameter nil 'tab-bar-lines 0)
(set-frame-parameter nil 'tab-bar-lines 1)
(set-frame-parameter nil 'tab-bar-lines 0)

2) Start emacs in text mode with:
emacs -nw -Q -l test.el

3) Create a few tabs with "C-x t 2"

The menu-bar is not showing after emacs starts. In addition, tabs start
to appear in two lines. Other visual artifacts (lines jumping around for
example) will become apparent after using emacs for a while.

In the real world this problem appeared because I had customized a
variable (tab-bar-select-tab-modifiers) that ran:

(tab-bar-mode -1)
(tab-bar-mode 1)

in its :set function.

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.25)
 of 2021-02-13 built on bastian-desktop
Repository revision: d3a399dd299bf7e811cf42950d5f8ac67f063b36
Repository branch: makepkg
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --with-nativecomp --without-gconf
 --without-gsettings --enable-link-time-optimization
 --with-x-toolkit=gtk3 --without-xaw3d --without-cairo
 --without-compress-install 'CFLAGS=-march=native -O2 -pipe -fno-plt
 -flto -fuse-linker-plugin -flto -fuse-linker-plugin'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Article

Minor modes in effect:
  recentf-mode: t
  helm-fuzzier-mode: t
  async-bytecomp-package-mode: t
  helm-flx-mode: t
  projectile-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  flx-ido-mode: t
  ido-everywhere: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  global-hi-lock-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/beischer/.emacs.d/elpa/cmake-mode-20210104.1831/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode
~/.emacs.d/lisp/buff-menu+ hides /usr/share/emacs/site-lisp/various/buff-menu+
~/.emacs.d/lisp/my-term hides /usr/share/emacs/site-lisp/various/my-term
~/.emacs.d/lisp/buff-menu hides /usr/share/emacs/site-lisp/various/buff-menu
~/.emacs.d/lisp/qt-pro hides /usr/share/emacs/site-lisp/various/qt-pro
~/.emacs.d/lisp/buff-menu hides /usr/share/emacs/28.0.50/lisp/buff-menu
~/.emacs.d/lisp/tab-bar hides /usr/share/emacs/28.0.50/lisp/tab-bar

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Memory information:
((conses 16 1040393 380066)
 (symbols 48 64112 40)
 (strings 32 242123 70791)
 (string-bytes 1 7741606)
 (vectors 16 94737)
 (vector-slots 8 1812716 598229)
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 (buffers 984 36))

Message #8 received at 46557 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Bastian Beranek <bastian.beischer <at> gmail.com>
Cc: 46557 <at> debbugs.gnu.org
Subject: Re: bug#46557: 28.0.50; Visual glitches in text mode when tab-bar
 visibility is altered at load time
Date: Wed, 05 May 2021 23:35:41 +0300

This bug can't be reproduced anymore, maybe it's already fixed?

> The following recipe creates a broken visual appearance of emacs in text
> mode, at least on GNU/Linux:
>
> 1) Create a test.el file with these lines:
>
> (set-frame-parameter nil 'tab-bar-lines 0)
> (set-frame-parameter nil 'tab-bar-lines 1)
> (set-frame-parameter nil 'tab-bar-lines 0)
>
> 2) Start emacs in text mode with:
> emacs -nw -Q -l test.el
>
> 3) Create a few tabs with "C-x t 2"
>
> The menu-bar is not showing after emacs starts. In addition, tabs start
> to appear in two lines. Other visual artifacts (lines jumping around for
> example) will become apparent after using emacs for a while.
>
> In the real world this problem appeared because I had customized a
> variable (tab-bar-select-tab-modifiers) that ran:
>
> (tab-bar-mode -1)
> (tab-bar-mode 1)
>
> in its :set function.

Message #11 received at 46557 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Bastian Beranek <bastian.beischer <at> gmail.com>
Cc: 46557 <at> debbugs.gnu.org
Subject: Re: bug#46557: 28.0.50; Visual glitches in text mode when tab-bar
 visibility is altered at load time
Date: Sun, 09 May 2021 20:37:56 +0300

> The following recipe creates a broken visual appearance of emacs in text
> mode, at least on GNU/Linux:
>
> 1) Create a test.el file with these lines:
>
> (set-frame-parameter nil 'tab-bar-lines 0)
> (set-frame-parameter nil 'tab-bar-lines 1)
> (set-frame-parameter nil 'tab-bar-lines 0)

This bug report can't be closed, because it seems
this problem is related to https://debbugs.gnu.org/46827#153
where setting tab-bar-lines to 1 changes tab-bar-lines to 2.
Reproducible test case:

(progn
  (set-frame-parameter nil 'tab-bar-lines 1)
  (let ((lines (frame-parameter nil 'tab-bar-lines)))
    (sit-for 0)
    (list lines (frame-parameter nil 'tab-bar-lines))))

returns (1 2)

Message #14 received at 46557 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>, Bastian Beranek <bastian.beischer <at> gmail.com>
Cc: 46557 <at> debbugs.gnu.org
Subject: Re: bug#46557: 28.0.50; Visual glitches in text mode when tab-bar
 visibility is altered at load time
Date: Mon, 10 May 2021 10:24:36 +0200

>> The following recipe creates a broken visual appearance of emacs in text
>> mode, at least on GNU/Linux:
>>
>> 1) Create a test.el file with these lines:
>>
>> (set-frame-parameter nil 'tab-bar-lines 0)
>> (set-frame-parameter nil 'tab-bar-lines 1)
>> (set-frame-parameter nil 'tab-bar-lines 0)
>
> This bug report can't be closed, because it seems
> this problem is related to https://debbugs.gnu.org/46827#153
> where setting tab-bar-lines to 1 changes tab-bar-lines to 2.
> Reproducible test case:
>
> (progn
>    (set-frame-parameter nil 'tab-bar-lines 1)
>    (let ((lines (frame-parameter nil 'tab-bar-lines)))
>      (sit-for 0)
>      (list lines (frame-parameter nil 'tab-bar-lines))))
>
> returns (1 2)

But IIUC the latter holds for a GUI only.  You cannot get two lines on a
TTY unless you wrap the tab bar (if that is possible on a TTY).

martin

Message #17 received at 46557 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 46557 <at> debbugs.gnu.org, Bastian Beranek <bastian.beischer <at> gmail.com>,
 Juri Linkov <juri <at> linkov.net>
Subject: Re: bug#46557: 28.0.50; Visual glitches in text mode when tab-bar
 visibility is altered at load time
Date: Fri, 17 Jun 2022 16:53:56 +0200

martin rudalics <rudalics <at> gmx.at> writes:

> But IIUC the latter holds for a GUI only.  You cannot get two lines on a
> TTY unless you wrap the tab bar (if that is possible on a TTY).

So I guess this means that this bug report can be closed after all, so
I'm now doing that.  If I misunderstood, please respond to the debbugs
address and we'll reopen.

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

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