[Bug 1562308] Re: missing or duplicate lines caused by a wrapped line with wide characters
Łukasz Zemczak
1562308 at bugs.launchpad.net
Tue Mar 21 15:28:15 UTC 2017
Hello Mitsuya! Thank you for preparing the debdiff. I checked upstream
and the bug in mention was indeed fixed there - but it seems that their
fix for mkutable (at upstream) is different. I would prefer if Ubuntu
didn't diverge from upstream if possible. Is it because the way it's
done in 487 is not applicable on top of 481? Or what is the reason for
the differences?
Thanks!
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https://bugs.launchpad.net/bugs/1562308
Title:
missing or duplicate lines caused by a wrapped line with wide
characters
Status in less package in Ubuntu:
Confirmed
Bug description:
When you scroll down text with "j" key and encounter a wrapped line
with wide characters (such as UTF8-encoded Japanese characters),
"less" seems to show the whole wrapped line at a single "j" key,
causing the view scroll down by 2 lines at once. Strangely, if you
type "k" to scroll up, it does that by only 1 line. As a result, there
is a missing line that should have been shown.
Even stranger stuff (i.e., duplicate lines) happens when you type "j"
and "k" alternately when a wrapped line with wide characters is at the
bottom of the view.
# Steps to reproduce
1. Open xterm.
2. Set the geometory of xterm to 71x22.
3. Open the attached lesstest.long_jap.txt with less (maybe you need
environment variable LANG=ja_JP.UTF-8)
4. Type "j", then you will see "003" at the top, and a long wrapped
line with Japanese characters at the bottom.
5. Type "k", then you will see "001" and "003" at the top. "002" is
missing.
# Expected behavior
In step 4, only the first part of the wrapped line should be shown.
In step 5, all "001", "002" and "003" should be shown.
# Test Environment
- Xubuntu 16.04 (Xenial) beta (in VirtualBox on Xubuntu 14.04)
- less: 481-2.1
- xterm: 322-1ubuntu1
- Japanese environment (LANG=ja_JP.UTF-8)
# Note
- The same problem happens on xfce4-terminal (0.6.3-2ubuntu1)
- lv (4.51-2.3build1) doesn't have such problem.
- In "less" in Xubuntu 14.04 (version 458-2), this problem didn't
exist.
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