Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/beans/ListenerSupport.java
/**
	 * @since 3.2
	 */
	 static class IdentityWrapper {
		final Object o;
		IdentityWrapper(Object o) {
			this.o = o;
		}
		public boolean equals(Object obj) {
			if(obj.getClass()!=IdentityWrapper.class) {
				return false;