Bug 126061 [Viewers] Need to document that virtual tables and trees ignore sorters and filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
* <code>ITableLabelProvider</code> or the <code>ILabelProvider</code>
 * interface (see <code>TableViewer.setLabelProvider</code> for more details).
 * </p>
 * <p>
 * As of 3.1 the TableViewer now supports the SWT.VIRTUAL
 * flag. It is important to note that if SWT.VIRTUAL is in use
 * that the Widget based APIs will return null in both the
 * cases where either the element is not specified or not
 * created yet. 
 * </p>
 * <p>
 * Users of SWT.VIRTUAL should also avoid using getItems()
 * from the Table within the TreeViewer as this does not
 * necessarily generate a callback for the TreeViewer 
 * to populate the items. It also has the side effect of
 * creating all of the items thereby eliminating the
 * performance improvements of SWT.VIRTUAL.
 * </p>
 * @see SWT#VIRTUAL
 * @see #doFindItem(Object)
 * @see #internalRefresh(Object, boolean)
 */
public class TableViewer extends StructuredViewer {
		
	private class VirtualManager{
		/**
		 * The currently invisible elements as provided 
		 * by the content provider or by addition.
		 * This will not be populated by an ILazyStructuredContentProvider
		 * as an ILazyStructuredContentProvider is only queried