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Bug#948516: marked as done (xterm: displays incorrect text when one scrolls backward while output is ongoing)

Your message dated Mon, 14 Feb 2022 16:51:33 +0100
with message-id <20220214155133.GA30229@cventin.lip.ens-lyon.fr>
and subject line Re: xterm: displays incorrect text when one scrolls backward while output is ongoing
has caused the Debian Bug report #948516,
regarding xterm: displays incorrect text when one scrolls backward while output is ongoing
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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immediately.)


-- 
948516: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948516
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: xterm
Version: 351-1
Severity: normal

With scrollTtyOutput set to "false", when one scrolls backward while
output is ongoing, xterm displays incorrect text. This is reproducible
with the xterm Debian package in the following versions (at least):
337-1, 341-1, 344-1, 348-2, 349-1, 351-1. It seems that xterm does not
fully erase the previous line when scrolling.

Testcase:

  xterm -geometry 80x24 -e 'echo $WINDOWID; sleep 5; for i in `seq 10000 10040`; do sleep 0.1; echo $i$i$i$i$i$i$i$i | cut -b -$(((RANDOM % 26) + 1)); done; sleep 999999'

I've attached a video showing the issue.

At 00:07, the video also shows the result of some double-clicks.
At 00:10, it shows the result of additional scrolling, once output
has ended: new text is correct.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-2-amd64 (SMP w/12 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xterm depends on:
ii  libc6           2.29-8
ii  libfontconfig1  2.13.1-2+b1
ii  libfreetype6    2.10.1-2
ii  libice6         2:1.0.9-2
ii  libtinfo6       6.1+20191019-1
ii  libutempter0    1.1.6-4
ii  libx11-6        2:1.6.8-1
ii  libxaw7         2:1.0.13-1+b2
ii  libxext6        2:1.3.3-1+b2
ii  libxft2         2.3.2-2
ii  libxinerama1    2:1.1.4-2
ii  libxmu6         2:1.1.2-2+b3
ii  libxpm4         1:3.5.12-1
ii  libxt6          1:1.1.5-1+b3
ii  xbitmaps        1.1.1-2

Versions of packages xterm recommends:
ii  x11-utils  7.7+4

Versions of packages xterm suggests:
pn  xfonts-cyrillic  <none>

-- no debconf information

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Attachment: output-scrolled.ogv
Description: Binary data


--- End Message ---
--- Begin Message --- 
Version: 354-1

On 2020-01-09 18:05:37 +0100, Vincent Lefevre wrote:
> With scrollTtyOutput set to "false", when one scrolls backward while
> output is ongoing, xterm displays incorrect text. This is reproducible
> with the xterm Debian package in the following versions (at least):
> 337-1, 341-1, 344-1, 348-2, 349-1, 351-1. It seems that xterm does not
> fully erase the previous line when scrolling.
[...]

I've tested several xterm versions (Debian packages). The bug is
reproducible with 352-1 and 353-1, but no longer reproducible with
354-1, 356-2, 360-1 and 370-2 (current version). So, closing and
marking as fixed in 354-1.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

--- End Message ---
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