[Webkit-unassigned] [Bug 176243] requestAnimationFrame causes bad location of position:fixed inside overflow:auto and iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176243

--- Comment #3 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
I did a quick debugging of this and the trace for requestAnimationFrame is something like:

RemoteLayerTreeDrawingArea::flushLayers
 |
(Timer)
 |
RemoteLayerTreeDrawingArea::scheduleCompositingLayerFlush
ScriptedAnimationController::scheduleAnimation
ScriptedAnimationController::registerCallback
Document::requestAnimationFrame
DOMWindow::requestAnimationFrame

where RemoteLayerTreeDrawingArea::flushLayers commit the scrolling state and is actually also called when we perform async scrolling on iOS. So I don't see anything abnormal. Maybe requestAnimationFrame should not commit the scrolling state and let that work be done by the async scrolling code to avoid conflicts?

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