NEW 191546
Can we avoid compositing overlap testing after page scroll? 
https://bugs.webkit.org/show_bug.cgi?id=191546
Summary Can we avoid compositing overlap testing after page scroll?
Simon Fraser (smfr)
Reported 2018-11-12 08:36:29 PST
RenderLayerCpmpositor has: if (updateType == CompositingUpdateType::OnScroll || updateType == CompositingUpdateType::OnCompositedScroll) { // Scrolling can affect overlap. FIXME: avoid for page scrolling. updateRoot->setDescendantsNeedCompositingRequirementsTraversal(); } We already extend overlap rects for fixed and sticky layers, so we should be able to avoid any new overlap testing on page scroll.
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