462741 - huge HR width value causes text rendering issues (on scrolling)

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[Alexander Sack]

on linux (ubuntu intrepid/hardy), trunk and 3.0

  http://sourceware.org/pthreads-win32/bugs.html

causes text rendering issues (smearing) when scrolling.

Seems to be the large WIDTH value for the HR:

	<HR WIDTH=140182812 ALIGN=RIGHT>


This is forwarded from ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/289839

one interesting hint from LP bug: "Webpage containing this large hr width is generated by OpenOffice."

Comment 1

[Alexander Sack]

Attachment: screen after scrolling

Comment 2

[Alexander Sack]

Attachment: before scrolling

Comment 3

[Ria Klaassen (not reading all bugmail)]

Oh well, Windows is even worse, where I only see black instead of text, but if I load the Options window over it, I see text. Next, when I switch tabs and switch back, it is black again.

Comment 4

[Mats Palmgren (inactive)]

Bug 215055?

Comment 5

[Ria Klaassen (not reading all bugmail)]

This regressed on 29 Oct 2008: http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=2007-10-28+22%3A00&maxdate=2007-10-30+00%3A00
I think this is caused by Bug 384681.

Comment 6

[Ria Klaassen (not reading all bugmail)]

(In reply to comment #5)
> This regressed on 29 Oct 2008:
I meant 2007. :)

Comment 7

[Ria Klaassen (not reading all bugmail)]

I think it should also be retested by someone on Linux, because it is not sure if we are talking about the same bug.

(In reply to comment #4)
> Bug 215055?

The black site I see is entirely black except the image on top, so not only on the bottom.

Comment 8

[Answ]

This bug is first appeared here:
(because I thought it was a Linux specific issue of Firefox
but later turned out that it also affected Windows version of the browser):
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/289839

I also made some research on it:
"I investigated the bug and found the cause:
hr with width 8388599 or less is OK
hr with width 8388600 or greater cause problem
Body background color must be set!

It is probably a 32 bit bug because 16777216/2=8388608.
(bit of sign)

And perhaps hr has padding or margin (2*4=8).

Someone could try it with a 64 bit version of Firefox.."

Comment 9

[Timothy Nikkel (:tnikkel)]

Does this problem still happen?

Comment 10

[Launchpad]

Answ added the following comment to Launchpad bug report 289839:

I've retested now with Firefox 10.0 on Fedora Core 16 and it seems to be fixed.
No rendering problem at all. 
Someone should check on Windows too.

Anyway I'm curious about in which version was it fixed :)

-- 
http://launchpad.net/bugs/289839

Comment 11

[Timothy Nikkel (:tnikkel)]

Thanks for testing.

No problem on Windows XP either. Let's close this.