The copy ctor of StyleRareNonInheritedData fails to copy m_maskBoxImage, and the operator== fails to compare the m_maskBoxImage.
Created attachment 22244 [details]
Comment on attachment 22244 [details]
Created attachment 22250 [details]
Patch with changelog
Bring hyatt's review forward.
Committing to http://svn.webkit.org/repository/webkit/trunk ...