We aren't sending mouse events on non-scrollable pages if the detected element has no mouse move handlers. We don't actually need to check that if the page doesn't scroll.
Created attachment 164174 [details] patch with commit log
Comment on attachment 164174 [details] patch with commit log Clearing flags on attachment: 164174 Committed r128625: <http://trac.webkit.org/changeset/128625>
All reviewed patches have been landed. Closing bug.