It's awkward to persist the console when showing the new tab view. Especially since creating a timeline tab will cause the console to hide, but other content views won't.
Created attachment 261194 [details] Proposed Fix
Comment on attachment 261194 [details] Proposed Fix r=me
Comment on attachment 261194 [details] Proposed Fix Clearing flags on attachment: 261194 Committed r189814: <http://trac.webkit.org/changeset/189814>
All reviewed patches have been landed. Closing bug.