Revert "Mouse: Changed mouseHandled check to a local var rather than using originalEvent. Fixed #4333 - Nested draggables problem in IE"
Revert "Mouse: Changed mouseHandled check to a local var rather than using originalEvent. Fixed #4333 - Nested draggables problem in IE"

This reverts commit 9c50bdfde0260fc8412eec1c5020ed6b61558ebd.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension