For now, we don't want the presence of a filter to drop you into a compositing layer. Later on we will add heuristics to determine when to use compositing layers, when to use CoreImage with hardware accelerated rendering and when to use the full software path.
Created attachment 121762 [details]
Comment on attachment 121762 [details]
Needs a testcase.
Created attachment 121883 [details]
Comment on attachment 121883 [details]
Attachment 121883 [details] did not pass gtk-ews (gtk):
Committed r104622: <http://trac.webkit.org/changeset/104622>