I noticed the recursive calls in Document::updateHoverActiveState does not forward the PlatformMouseEvent* pointer. This means the nested frames will not have enough information to emit mouseleave.
Created attachment 211023 [details] Patch
Comment on attachment 211023 [details] Patch Attachment 211023 [details] did not pass mac-ews (mac): Output: http://webkit-queues.appspot.com/results/1732374 New failing tests: fast/events/mouseleave-on-subframe.html
Created attachment 211034 [details] Archive of layout-test-results from webkit-ews-04 for mac-mountainlion The attached test failures were seen while running run-webkit-tests on the mac-ews. Bot: webkit-ews-04 Port: mac-mountainlion Platform: Mac OS X 10.8.4
mouseenter on DIV mouseenter on BODY mouseenter on HTML +mouseenter on #document mouseleave on DIV mouseleave on BODY mouseleave on HTML +mouseleave on #document Ah, perfect. Testing bug 120862
Committed r155348: <http://trac.webkit.org/changeset/155348>