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simon.fraser@apple.com authored
Reviewed by John Sullivan <rdar://problem/6953673> Crash in RenderLayerCompositor::setCompositingParent Fix a crash that could occur in complex content due to timing issues when doing a partial layer tree rebuild which is required when painting; setCompositingParent() could be called with a parent which has not been made compositing yet. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@44876 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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