public static JPopupMenu leftShift(JPopupMenu self, Action action) {
        self.add(action);
        return self;
    }
public static JPopupMenu leftShift ( JPopupMenu self , Action action ) { self . add ( action ) ; return self ; }
Overloads the left shift operator to provide an easy way to add
components to a popupMenu.<p>

@param self   a JPopupMenu
@param action an action to be added to the popupMenu.
@return same popupMenu, after the value was added to it.
@since 1.6.4