Public bug reported:
When environment varibable "VTE_CJK_WIDTH=1" is set, byobu-tmux is
scroll-out infinitely.
How to reproduce:
1) install precise.
2) open gnome-terminal
3) exec:
$ export VTE_CJK_WIDTH=1; gnome-terminal --disable-factory
Notes: if you exec gnome-terminal without disable-factory, gnome-
terminal will take over the environment variable of parents' initial
condition, so VTE_CJK_WIDTH will be ignored.
3') another aproach:
create /etc/profile.d/vte_cjk_width.sh file as follows, and session
restart(log-out and log-in)
------------------------------------------
$ cat /etc/profile.d/vte_cjk_width.sh
export VTE_CJK_WIDTH=1
------------------------------------------
4) exec:
byobu-tmux (or byobu)
Workaround:
disable "logo" indicator from byobu-config.
(if you want edit config directoly, edit you .byobu/status::tmux_left :
"logo" -> "#logo" )
Root cause:
byobu-tmux(byobu with tmux backends) use the Ubuntu Logo character from Ubuntu
Fonts. Ubuntu Logo char hits "East Asian Ambiguous" problem, that have
ambigous-wide, so that switch the wide of rendering at run-time.
When VTE_CJK_WIDTH=0 or not set, the Ubuntu Logo wide is 1, but,
when VTE_CJK_WIDTH=1, the Ubuntu Logo wide is 2. So that cause the scrolling
problem.
Background:
For historical reason, "VTE_CJK_WIDTH=1" is libvte's workaround of
Unicode::"East Asian Ambiguous width" problem, when VTE_CJK_WIDTH=0, the
ambigous wide char's wide is 1, therefor VTE_CJK_WIDTH=1 is set, the ambigous
wide char's wide is 2.
In CJK environment(ESP Japanese), that workaround is important for
CLI/terminal sessions. If that is not set, the ambigous wide char render
without correctness wide. So, I believe that many CLI/terminal users enable the
VTE_CJK_WIDTH=1 in their /etc/profile.d/ at Japan.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: byobu 5.16-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
Date: Mon Mar 12 13:20:24 2012
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
PackageArchitecture: all
ScreenRC:
SourcePackage: byobu
UpgradeStatus: Upgraded to precise on 2012-03-12 (0 days ago)
** Affects: byobu (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 precise
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https://bugs.launchpad.net/bugs/952724
Title:
status area scrolled out infinitely (tmux-backend with libvte +
VTE_CJK_WIDTH=1)
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