[Webkit-unassigned] [Bug 52735] New: [Qt] painting of windowed plugins faulty on certain scroll events

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52735

           Summary: [Qt] painting of windowed plugins faulty on certain
                    scroll events
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Keywords: Qt, QtTriaged
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: robert at webkit.org


I noticed this while fixing the specific issue in bug 52734. The patch at bug 52734 doesn't fix it.

If you open plugins/iframe-shims.html in QtTestBrowser and resize to narrow rectangle, then shorten the window so that you can scroll up and down about 100 pixels in one step, you'll notice that after scrolling up and down once or twice (single steps, gradual scrolling won't reproduce) that the blue plugins disappear from the first two boxes in the top row. Instead they get rendered over the plugins on the two rows beneath the top row. 

I can't take a screenshot of this because ksnapshot repaints the entire screen first, which results in the plugins getting repainted properly.

This alone suggests we need to trigger an extra paint event on the frame at some point, but I'm not sure when.

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