RenderRegion is only added to the RenderFlowThread if there's no renderer after it in the container box. That's because only RenderObjectChildList::removeChildNode and RenderObjectChildList::appendChildNode were patched to add RenderRegion checks. The RenderObjectChildList::insertChildNode also needs to be updated to take care of insertions.
Created attachment 104984 [details] Patch V1
Created attachment 104985 [details] Patch V2
Comment on attachment 104985 [details] Patch V2 r=me
Comment on attachment 104985 [details] Patch V2 Rejecting attachment 104985 [details] from commit-queue. Failed to run "['./Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '--bot-id=ec2-cq-03', '--port..." exit_code: 2 Last 500 characters of output: cted.txt patching file LayoutTests/fast/regions/content-flowed-into-regions-dynamically-inserted.html patching file Source/WebCore/ChangeLog Hunk #1 succeeded at 1 with fuzz 3. patching file Source/WebCore/rendering/RenderObjectChildList.cpp Hunk #1 FAILED at 244. 1 out of 1 hunk FAILED -- saving rejects to file Source/WebCore/rendering/RenderObjectChildList.cpp.rej Failed to run "[u'/mnt/git/webkit-commit-queue/Tools/Scripts/svn-apply', u'--reviewer', u'David Hyatt', u'--force']" exit_code: 1 Full output: http://queues.webkit.org/results/9493014
Created attachment 105027 [details] Patch Rebased
Comment on attachment 105027 [details] Patch Rebased r=me
Comment on attachment 105027 [details] Patch Rebased Clearing flags on attachment: 105027 Committed r93721: <http://trac.webkit.org/changeset/93721>
All reviewed patches have been landed. Closing bug.