The AppKit methods that we call into in ScrollAnimatorMac::mouseEnteredScrollbar() and mouseExitedScrollbar() are really unique to legacy scrollbar concepts. We should avoid sending those notifications when the scrollbars are overlay. Patch forthcoming. <rdar://problem/10603290>
Created attachment 122145 [details] Patch
Comment on attachment 122145 [details] Patch Hmm, this doesn't seem to be entirely sufficient.
(In reply to comment #2) > (From update of attachment 122145 [details]) > Hmm, this doesn't seem to be entirely sufficient. No, it is. I was just encountering a different bug.
Thanks Sam! Committed change with http://trac.webkit.org/changeset/104837