- fixed 3145317 - Unable to add or remove menu items on Site Menu page using Safari Beta

	This turned out to be a problem with event.layerX / event.layerY.

        * khtml/xml/dom2_eventsimpl.cpp:
        (MouseEventImpl::computeLayerPos): Since layer position is
	relative to parent layer, go up the layer tree adjusting for layer
	offset to compute true layer position.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3364 268f45cc-cd09-0410-ab3c-d52691b4dbfc