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akling@apple.com authored
<https://webkit.org/b/120684> Reviewed by Antti Koivisto. Subtree relayout scheduling should only happen while there's a render tree up, the code can freely assume that there's a RenderView present. Added an assertion that the render tree isn't being torn down. This should catch renderers doing unnecessary work during document detach and could be a source of "performance freebies." I also un-nested scheduleRelayoutOfSubtree() with early-return style to make the code more human-readable. * page/FrameView.h: * page/FrameView.cpp: (WebCore::FrameView::scheduleRelayoutOfSubtree): * rendering/RenderObject.cpp: (WebCore::RenderObject::scheduleRelayout): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155046 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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