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
*            the corresponding widget
	 */
	protected void mapElement(Object element, Widget item) {
		if (elementMap != null)
			elementMap.put(element, item);
	}
	/**
	 * Determines whether a change to the given property of the given element
	 * would require refiltering and/or resorting.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * 
	 * @param element
	 *            the element
	 * @param property
	 *            the property
	 * @return <code>true</code> if refiltering is required, and
	 *         <code>false</code> otherwise
	 */
	protected boolean needsRefilter(Object element, String property) {
		if (sorter != null && sorter.isSorterProperty(element, property))
			return true;
		if (filters != null) {
			for (int i = 0, n = filters.size(); i < n; ++i) {
				ViewerFilter filter = (ViewerFilter) filters.get(i);
				if (filter.isFilterProperty(element, property))
					return true;
			}