[Webkit-unassigned] [Bug 101242] New: flash rendering messed up when web page is scrolled.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101242

           Summary: flash rendering messed up when web page is scrolled.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://finance.yahoo.com/echarts?s=%5EGSPC+Interactive
                    #symbol=%5Egspc;range=1d;compare=;indicator=volume;cha
                    rttype=area;crosshair=on;ohlcvalues=0;logscale=off;sou
                    rce=undefined;
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P1
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sfcheng at gmail.com


Created an attachment (id=172372)
 --> (https://bugs.webkit.org/attachment.cgi?id=172372&action=review)
screenshot of yahoo finance flash content when messed up.

On many sites with flash video or other flash content, when the web page is scrolled up or down, the rendering of the flash content is completely messed up. Part of the content could be even rendered outside the designated element boundary. This issue has started since QT 4.8.0 and remains in QT 4.8.3. It happens to the Windows platform only. Here are a few example pages:

1. Yahoo finance stock chart: http://finance.yahoo.com/echarts?s=%5EGSPC+Interactive#symbol=%5Egspc;range=1d;compare=;indicator=volume;charttype=area;crosshair=on;ohlcvalues=0;logscale=off;source=undefined; 
2. http://www.nrc.nl/nieuws/2012/08/06/terugkijken-zomergasten-afgebroken-na-migraine-aanval-jolande-withuis/?utm_campaign=rss&utm_source=syndication 
3. http://video.sina.com.cn/p/news/s/v/2012-01-09/071861635853.html?opsubject_id=top1

Hopefully somebody can get their hands on this issue. This issue is very prevalent and appears on a long list of websites. I have to stick to Qt 4.7.4 so far due to this major bug. 

A screenshot is attached to illustrate what it looks when the stock chart is messed up on yahoo finance after scrolling.

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