[Webkit-unassigned] [Bug 34381] New: Incomplete repaint of YouTube timeline thumb while scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=34381

           Summary: Incomplete repaint of YouTube timeline thumb while
                    scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: GoogleBug, HasReduction, NeedsRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: simon.fraser at apple.com


Created an attachment (id=47778)
 --> (https://bugs.webkit.org/attachment.cgi?id=47778)
Reduction

The timeline thumb on YouTube videos using a custom <video> controller leaves
trails behind if the page is scrolled while the video is playing. This is
apparently caused by a scroll event listener that forces layout, and can be
reproduced with the attached reduction by scrolling it slowly, either by
Option-dragging the scroller or scrolling with a Magic Mouse.

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