Public bug reported:
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.
** Affects: less (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Example input that causes the problem"
https://bugs.launchpad.net/bugs/1562308/+attachment/4612456/+files/lesstest.long_jap.txt
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https://bugs.launchpad.net/bugs/1562308
Title:
missing or duplicate lines caused by a wrapped line with wide
characters
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