[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 #4 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
Created attachment 326879

  --> https://bugs.webkit.org/attachment.cgi?id=326879&action=review

Experimental patch

This patch is a quick dirty hack to force a delayed flush when RemoteLayerTreeDrawingArea::scheduleCompositingLayerFlush is caused by a requestAnimationFrame call. As you can see, it avoids big jumps of the fixed element in the testcase. I wonder whether we should do something like that when user scrolling is happening... @Simon: WDYT?

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