The specs mention the following in the second step of the algorithm described in "Resolve Intrinsic Track Sizes section":
"2- Increase sizes to accommodate spanning items: Next, consider the items with a span of 2 that do not span a track with a flexible sizing function"
We are using those items so we must detect and keep them away for further actions.
Created attachment 245069 [details]
Comment on attachment 245069 [details]
r=me, but didn't apply, so watch layout tests.
Committed r178895: <http://trac.webkit.org/changeset/178895>