Currently ContentFlowTreeContentView creates one DOMTreeOutline for each root element with "-webkit-flow-into". The issue is that DOMTreeOutline objects are disconnected, so navigation across root elements is also broken.
Also, ContentFlowTreeContentView tends to reimplement a lot of the DOMTreeContentView, so finding a way to inherit from it would save a lot of duplicated code.
Created attachment 216723 [details]
Created attachment 216725 [details]
Renamed ContentFlowTreeContentView to ContentFlowDOMTreeContentView to better reflect the inheritance of the object.
Comment on attachment 216725 [details]
Clearing flags on attachment: 216725
Committed r159151: <http://trac.webkit.org/changeset/159151>
All reviewed patches have been landed. Closing bug.