Bug 89137 [JFace] - API Review - "temporary" API in AbstractTreeViewer
AbstractTreeViewer contains two methods documented as "temporary" internalRefresh(Widget, Object) internalAdd(Widget, Object, Object [])
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
/**
	 * A map from the viewer's model elements to SWT widgets. (key type:
	 * <code>Object</code>, value type: <code>Widget</code>).
	 * <code>null</code> means that the element map is disabled.
	 */
	private CustomHashtable elementMap;
	/**
	 * The comparer to use for comparing elements, or <code>null</code> to use
	 * the default <code>equals</code> and <code>hashCode</code> methods on
	 * the element itself.
	 */
	private IElementComparer comparer;
	/**