Tooltips are sometimes not shown because coordiantes are not converted from contents to window.
Created attachment 75007 [details] Patch that fixes the problem
Comment on attachment 75007 [details] Patch that fixes the problem Clearing flags on attachment: 75007 Committed r72787: <http://trac.webkit.org/changeset/72787>
All reviewed patches have been landed. Closing bug.
http://trac.webkit.org/changeset/72787 seems to crash fast/events/mouseover-mouseout2.html on both GTK Linux 32-bit Release and GTK Linux 64-bit Debug bots. Apologies if I'm wrong (this is really a weird combination).
Yep, seems like this patch breaks the test indeed. See also http://webkit-bots.igalia.com/amd64/svn_72787.core-when_1291031897-_-who_DumpRenderTree-_-why_11.trace.html