Bug 147530 [DataBinding] Provide event objects for change listeners
Before data binding goes 1.0 it would be wise to provide EventObjects for the following listeners to ensure that the API doesn't preclude future expansion of the values supplied to listeners. Interfaces that would be affected: * IValueChangeListener * IValueChangingListener * IListChangeListener * ISetChangeListener * IMappingChangeListener
bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/set/ObservableSet.java
for (int i = 0; i < listeners.length; i++) {
			listeners[i].handleSetChange(this, diff);
		}
	}
	
	public boolean contains(Object o) {
		getterCalled();
		return wrappedSet.contains(o);
	}
	public boolean containsAll(Collection c) {
		getterCalled();
		return wrappedSet.containsAll(c);
	}
	public boolean equals(Object o) {
		getterCalled();
		return wrappedSet.equals(o);
	}
	public int hashCode() {
		getterCalled();
		return wrappedSet.hashCode();
	}
	public boolean isEmpty() {
		getterCalled();
		return wrappedSet.isEmpty();
	}
	public Iterator iterator() {
		final Iterator wrappedIterator = wrappedSet.iterator();
		return new Iterator() {
			public void remove() {
				throw new UnsupportedOperationException();