tree fe020921d8d15589ee2f00aab3bed007a9c9ac19
parent ecdffc333b23493533925a6a80de25d9c41c5413
author simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1566668125 +0000
committer simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1566668125 +0000

RenderLayer::updateLayerPositions() doesn't propagate the ancestor flags correctly
https://bugs.webkit.org/show_bug.cgi?id=201115

Reviewed by Zalan Bujtas.

When an updateLayerPositions() traversal starts at a non-root layer, we failed to populate
the ancestor-related UpdateLayerPositionsFlag flags, leaving layers with missing flags
(e.g. the m_hasTransformedAncestor flag). This is detected by the patch in bug 201066.

Fix by having updateLayerPositionsAfterStyleChange() and updateLayerPositionsAfterLayout()
initialize the flags from the parent layer.

This is a behavior change not detected by any existing test, but will be exercised once
the patch from bug 201066 lands.

* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::flagsForUpdateLayerPositions):
(WebCore::RenderLayer::updateLayerPositionsAfterStyleChange):
(WebCore::RenderLayer::updateLayerPositionsAfterLayout):
(WebCore::outputPaintOrderTreeLegend):
(WebCore::outputPaintOrderTreeRecursive): Log hasTransformedAncestor().
* rendering/RenderLayer.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@249088 268f45cc-cd09-0410-ab3c-d52691b4dbfc