660118 - Using scrollwheel to scroll page leaves artifacts on screen in certain situations (repaint issue)

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Amy]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_7) AppleWebKit/534.24 (KHTML, like Gecko) Chrome/11.0.696.71 Safari/534.24
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.17) Gecko/20110420 Firefox/3.6.17

I have an element that starts off absolutely positioned, that then switches to a static positioned element once the browser scrolls past a certain point. The element also has overflow-y: auto assigned to it to scroll independently from the page.

In Firefox 3.6 - once it hits its static position, using the scrollwheel causes artifacts to be left on the portion of the screen with the overflow. Dragging the scrollbar sets everything right again.

Reproducible: Always

Steps to Reproduce:
1. Used mouse wheel to scroll a portion of a page with an overflow property and fixed positioning
2. 
3.

Actual Results:  
Artifacts left behind, screen not repainted properly

Comment 1

[Amy]

Attachment: Example of the artifacting caused by scrolling the pane

Comment 2

[Amy]

Attachment: Example of the artifacting caused by scrolling the pane

Grabbed a better screenshot

Comment 3

[(mostly gone) XtC4UaLL [:xtc4uall]]

Can you attach a reduced Testcase or point to a URL showing the Issue?
Does it happen in Firefox 3.6 only? What about 4/5/6/Trunk?

Comment 4

[Amy]

(In reply to comment #3)
> Can you attach a reduced Testcase or point to a URL showing the Issue?
> Does it happen in Firefox 3.6 only? What about 4/5/6/Trunk?


Sorry this took so long. Had to extract it from an internal web-app. Here is a URL that displays the issue for me:

http://www.wormfood.com/test/ff36-smear.html

I've only seen the behavior with 3.6 on the Mac.  Tested it out in 4, and didn't see any problem. 

Noticing now that it happens with a 2 finger scroll on the macbook too in addition to mousewheel. I captured a video of what I'm seeing as well:

http://www.wormfood.com/test/ff36-scroll.swf

Comment 5

[(mostly gone) XtC4UaLL [:xtc4uall]]

Thanks! The Issue isn't happening on Firefox 3.6 (and later) on WinXP.
Since it works for you on MacOS on 4 too I presume what is to be checked what Checkin in the 4 Cycle fixed this and if it's feasible to backport it to the 1.9.2. Branch.

Comment 6

[Vlad [QA]]

WFM also on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:7.0a1) Gecko/20110620 Firefox/7.0a1

Considering comment4, can you please change the status of this bug to Resolved WFM.
Thx

Comment 7

[Vlad [QA]]

Considering comment4 and comment6, setting resolution to Resolved WFM.