| 2016-03-26 13:33:26 |
Toshio Ito |
bug |
|
|
added bug |
| 2016-03-26 13:33:26 |
Toshio Ito |
attachment added |
|
Example input that causes the problem https://bugs.launchpad.net/bugs/1562308/+attachment/4612456/+files/lesstest.long_jap.txt |
|
| 2016-08-01 16:08:09 |
Launchpad Janitor |
less (Ubuntu): status |
New |
Confirmed |
|
| 2016-09-14 10:20:19 |
Mitsuya Shibata |
bug |
|
|
added subscriber Mitsuya Shibata |
| 2016-09-15 10:59:04 |
Mitsuya Shibata |
less (Ubuntu): status |
Confirmed |
In Progress |
|
| 2016-09-15 11:24:33 |
Mitsuya Shibata |
attachment added |
|
fix-1562308.debdiff https://bugs.launchpad.net/ubuntu/+source/less/+bug/1562308/+attachment/4741380/+files/fix-1562308.debdiff |
|
| 2016-09-15 11:24:55 |
Mitsuya Shibata |
bug |
|
|
added subscriber Ubuntu Sponsors Team |
| 2016-09-16 07:07:03 |
Mathew Hodson |
tags |
|
xenial |
|
| 2016-09-16 07:08:00 |
Mathew Hodson |
less (Ubuntu): importance |
Undecided |
Medium |
|
| 2016-09-16 13:11:09 |
Mitsuya Shibata |
less (Ubuntu): status |
In Progress |
Confirmed |
|
| 2017-01-20 21:31:16 |
Brian Murray |
bug |
|
|
added subscriber Brian Murray |
| 2017-03-24 18:12:45 |
Mitsuya Shibata |
attachment added |
|
fix-1562308.debdiff https://bugs.launchpad.net/ubuntu/+source/less/+bug/1562308/+attachment/4844867/+files/fix-1562308.debdiff |
|
| 2017-03-24 18:13:27 |
Mitsuya Shibata |
tags |
xenial |
patch patch-accepted-upstream xenial |
|
| 2017-03-29 10:24:34 |
Łukasz Zemczak |
nominated for series |
|
Ubuntu Yakkety |
|
| 2017-03-29 10:24:34 |
Łukasz Zemczak |
bug task added |
|
less (Ubuntu Yakkety) |
|
| 2017-03-29 10:24:34 |
Łukasz Zemczak |
nominated for series |
|
Ubuntu Xenial |
|
| 2017-03-29 10:24:34 |
Łukasz Zemczak |
bug task added |
|
less (Ubuntu Xenial) |
|
| 2017-03-29 10:39:52 |
Łukasz Zemczak |
less (Ubuntu Xenial): importance |
Undecided |
Medium |
|
| 2017-03-29 10:39:55 |
Łukasz Zemczak |
less (Ubuntu Yakkety): importance |
Undecided |
Medium |
|
| 2017-03-29 10:46:22 |
Łukasz Zemczak |
removed subscriber Ubuntu Sponsors Team |
|
|
|
| 2017-03-31 10:08:06 |
Łukasz Zemczak |
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. |
[Impact]
Currently less doesn't work correctly with UTF-8 encoded Japanese characters, wrapping the lines in an invalid manner, missing or duplicating them (see original description below for exact error cases). For locale like these it breaks the general workflow, making the tool unreliable.
[Test Case]
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 only the first part of
the wrapped line should be shown.
5. Type "k", then you will see "001", "002" and "003" at the top.
[Regression Potential]
Rather low as the fix is present in the beta version of less for over 5 months already, which seems to be enough time for general audience testing. But since the width tables are modified potentially this could lead to other similar breakages related to wide-character handling.
[Original 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. |
|
| 2017-03-31 10:37:38 |
Launchpad Janitor |
less (Ubuntu): status |
Confirmed |
Fix Released |
|
| 2017-04-05 13:08:10 |
Chris J Arges |
less (Ubuntu Xenial): status |
New |
Fix Committed |
|
| 2017-04-05 13:08:13 |
Chris J Arges |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2017-04-05 13:08:15 |
Chris J Arges |
bug |
|
|
added subscriber SRU Verification |
| 2017-04-05 13:08:21 |
Chris J Arges |
tags |
patch patch-accepted-upstream xenial |
patch patch-accepted-upstream verification-needed xenial |
|
| 2017-04-05 13:10:33 |
Chris J Arges |
less (Ubuntu Yakkety): status |
New |
Fix Committed |
|
| 2017-04-06 01:10:14 |
Mitsuya Shibata |
attachment added |
|
Test on xenial https://bugs.launchpad.net/ubuntu/+source/less/+bug/1562308/+attachment/4855863/+files/Screenshot%20from%202017-04-06%2009-53-00.png |
|
| 2017-04-06 01:10:51 |
Mitsuya Shibata |
attachment added |
|
Test on yakkety https://bugs.launchpad.net/ubuntu/+source/less/+bug/1562308/+attachment/4855864/+files/Screenshot%20from%202017-04-06%2010-04-18.png |
|
| 2017-04-06 01:11:17 |
Mitsuya Shibata |
tags |
patch patch-accepted-upstream verification-needed xenial |
patch patch-accepted-upstream verification-done xenial yakkety |
|
| 2017-04-06 01:13:05 |
Mitsuya Shibata |
tags |
patch patch-accepted-upstream verification-done xenial yakkety |
patch patch-accepted-upstream verification-done verification-done-xenial verification-done-yakkety |
|
| 2017-04-13 20:14:02 |
Brian Murray |
tags |
patch patch-accepted-upstream verification-done verification-done-xenial verification-done-yakkety |
patch patch-accepted-upstream verification-done verification-done-xenial verification-done-yakkety verification-failed |
|
| 2017-06-20 14:48:03 |
Mitsuya Shibata |
tags |
patch patch-accepted-upstream verification-done verification-done-xenial verification-done-yakkety verification-failed |
patch patch-accepted-upstream verification-done verification-done-xenial verification-done-yakkety |
|
| 2017-06-22 12:50:11 |
Robie Basak |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2017-06-22 12:50:21 |
Launchpad Janitor |
less (Ubuntu Yakkety): status |
Fix Committed |
Fix Released |
|
| 2017-06-22 13:00:15 |
Launchpad Janitor |
less (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
