jquery/jquery-ui — pull request #1036 by nickpierpoint (2013-07-30 11:58:31+00:00)
Title: Menubar: event object not passed for preventDefault

event.preventDefault() is called at the end of the focus and focus
events but the event object was not passed into the event functions.

I spotted this when testing in IE8, in which preventDefault isn't available on the non-jquery event object.