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
* This viewer's sorter. <code>null</code> means there is no sorter.
	 */
	private ViewerSorter sorter;
	/**
	 * This viewer's filters (element type: <code>ViewerFilter</code>).
	 * <code>null</code> means there are no filters.
	 */
	private List filters;
	/**
	 * Indicates whether a selection change is in progress on this viewer.
	 * 
	 * @see #setSelection(ISelection, boolean)
	 */
	private boolean inChange;
	/**
	 * Used while a selection change is in progress on this viewer to indicates
	 * whether the selection should be restored.
	 * 
	 * @see #setSelection(ISelection, boolean)
	 */
	private boolean restoreSelection;
	/**
	 * List of double-click state listeners (element type:
	 * <code>IDoubleClickListener</code>).
	 * 
	 * @see #fireDoubleClick
	 */
	private ListenerList doubleClickListeners = new ListenerList(1);
	/**
	 * List of open listeners (element type: