200863 - Scrolling artefacts/slow scrolling due to hidden divs

Status: RESOLVED DUPLICATE of bug 198062

(Core :: Web Painting, defect, P2)

Description

[nick slussar]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030405
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030405

if you go to the mozillanews page, mouse over the build bar and after that try
scrolling, there will be artefacts from some rectangular are on the page being a
bit late in scrolling after the rest of the page. scrolling is very slow too.

if you don't mouseover the buld bar, it will scroll much faster. sometimes with
artefacts, sometimes without.

Reproducible: Always

Steps to Reproduce:
0. turn on smoothscrolling 
1. http://www.mozillanews.org/
2. move mouse over the build bar 
   (gray bar on top of the page with words qw(Linux Mac9x OSX Win32 Sparc)
3. try scrolling after that

Actual Results:  
slow scrolling, artefacts

Expected Results:  
scrolling as usual, no artefacts

it happens even if you don't mouseover the build bar. it would be fast as usual,
and sometimes there will be artefacts, and sometimes everything will be fine.

Comment 1

[Jesiah S]

I see this too in LInux 2003040308  
Also I get the same results w/o smoothscrolling.
The page is using visibility to change between hidden and visible.

Comment 2

[Stefan Borggraefe]

I also see this with Build 2003040622 and Windows XP.
The artefacts are there regardless of whether smooth scroll is enabled or not.
Also scrolling is slow with and without smooth scrolling. So I remove the "with
smooth scrolling" part from the summary.

Somehow the hidden divs disturb the layout. I think Layout: View Rendering is
the right component for these kinds of bugs.

Comment 3

[Sander]

This regressed between the branching of 1.3 (20030222 - at least I deduce this
from testing with a build from further on the branch) and 2003031004. Anyone
have some builds from in between that time period to further narrow this down?

I agree that smoothscrolling isn't necessary for this; hovering the build bar is
necessary for me (win98) - easiest to see on the vote page:
http://www.mozillanews.org/vote_details.php3

Comment 4

[Sander]

*** Bug 203087 has been marked as a duplicate of this bug. ***

Comment 5

[basic]

dupe

*** This bug has been marked as a duplicate of 198062 ***