[Webkit-unassigned] [Bug 109033] New: [Qt] Coordinated Graphics: scroll animation makes fixed element shake.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109033

           Summary: [Qt] Coordinated Graphics: scroll animation makes
                    fixed element shake.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


When panning using touch, we can see shaking fixed element in ManualTests/fixed-position.html

Strangely, if you early return in TextureMapperLayer::setScrollPositionDeltaIfNeeded, this shaking disappears.
void TextureMapperLayer::setScrollPositionDeltaIfNeeded(const FloatSize& delta)
{
+    return;
    ...
}

But when you drag using touch, we can see shaking with 'early return'.

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