Bug 140902 - layout issue in some web pages with pango enabled
Summary: layout issue in some web pages with pango enabled
Alias: None
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: firefox (Show other bugs)
(Show other bugs)
Version: 4.0
Hardware: All Linux
Target Milestone: ---
: ---
Assignee: Christopher Blizzard
QA Contact:
Keywords: i18n
Depends On:
Blocks: 158511
TreeView+ depends on / blocked
Reported: 2004-11-26 08:09 UTC by Lawrence Lim
Modified: 2014-03-26 00:51 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-05-23 06:12:09 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
latest version of firefox. (235.70 KB, image/png)
2004-11-26 08:11 UTC, Lawrence Lim
no flags Details
firefox with no pango enabled. (319.79 KB, image/png)
2004-11-26 08:12 UTC, Lawrence Lim
no flags Details
simpiler test case for above steps (798 bytes, text/html)
2004-12-06 07:11 UTC, Leon Ho
no flags Details

Description Lawrence Lim 2004-11-26 08:09:12 UTC
Description of problem:
With pango enabled, firefox is unable to display the layout properly
in some web pages.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.LANG=zhTW.UTF-8 firefox
2.gp to the following URL, http://tw.news.yahoo.com/
Actual results:
layout is not displayed properly. pls see screenshot

Expected results:
should be display properly. pls see screenshot with older version of
firefox with no pango enabled.

Additional info:
Try with firefox-0.10.1-1.0PR1.20, the layout is displayed properly.
However, if I use LANG=zh_TW MOZ_ENABLE_PANGO=1 firefox, i get the
same result as the current version of firefox

Comment 1 Lawrence Lim 2004-11-26 08:11:31 UTC
Created attachment 107474 [details]
latest version of firefox.

Marked the area with the layout problem

Comment 2 Lawrence Lim 2004-11-26 08:12:52 UTC
Created attachment 107475 [details]
firefox with no pango enabled.

Comment 3 Christopher Aillon 2004-11-26 09:55:28 UTC
->blizzard, the man with the pango.

Comment 4 Christopher Blizzard 2004-11-29 20:04:56 UTC
Is it possible for you to get that down to a very small test case?

Comment 6 Leon Ho 2004-12-06 07:11:12 UTC
Created attachment 107931 [details]
simpiler test case for above steps

Comment 7 Leon Ho 2004-12-06 07:17:27 UTC
It works in en_US.UTF-8 but does not work in zh_TW.UTF-8, ja_JP.UTF-8
etc, so it may be some different fonts with width calculation issue.

Comment 8 Warren Togami 2004-12-11 21:00:06 UTC
With en_US.UTF-8 I am seeing the bad layout in the
http://tw.news.yahoo.com/ but not in llch's simpler test case.

Comment 10 Warren Togami 2004-12-11 21:23:29 UTC
Furthermore, I suspect this may only be a case of bad HTML.  Good HTML
would not make assumptions about font size.  If you shrink the font by
one point (use CTRL--) the layout corrects itself.

For this reason I really see no good reason for blocking pango by
default.  Please reconsider for RC... or at least GA.

Comment 12 Jens Petersen 2005-03-18 10:21:19 UTC
This appears to be fixed in fc4test1 at least. :)

Comment 14 Lawrence Lim 2005-05-23 06:12:09 UTC
Pango has only been enabled for indic locales in EL4, hence, the bug is no
longer relevant. However, in FC4, firefox-1.0.4-2, where pango is enabled by
default, I still see layout issue in some web pages.

Closing this bug and created Bug 158511 for tracking the issue in FC.

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