Bug 305703 [Viewers][CommonNavigator] remembered contributions can leak when using filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewerInternals.java
/**
	 * Nothing to see here.
	 * 
	 * @since 3.5
	 * @noextend This interface is not intended to be extended by clients.
	 * @noimplement This interface is not intended to be implemented by clients.
	 */
	protected static interface AssociateListener {
		/**
		 * Call when an element is associated with an Item
		 * 
		 * @param element
		 * @param item
		 */
		void associate(Object element, Item item);
		/**
		 * Called when an Item is no longer associated
		 * 
		 * @param item
		 */