In WebPagePrivate::fixedLayoutSize we were using absoluteVisibleOverflowSize to determine fixed layout size. But absoluteVisibleOverflowSize remains old value when rotating.
Created attachment 160728 [details] Patch
Comment on attachment 160728 [details] Patch Clearing flags on attachment: 160728 Committed r126772: <http://trac.webkit.org/changeset/126772>
All reviewed patches have been landed. Closing bug.
Re-opened since this is blocked by 95137