Regression after 206bbf8. In this commit, the following code was added:
if ( elem[ type ] ) {
elem[ type ]();
} else …
But in this code, the event object is not passed to the handler! It leads to lots of bugs, for example, inability to use options for the click event:
$('button').simulate('click', { button: 2 }); /* right mouse button */
It has bad influence on the focus (and hence focusin and focusout) event as well.