Bug 84314 [Viewers] Need to allow mapping elements to multiple widgets/items
One of the projects I am working on is using an essentially graph structured dependancy model and we use TableTreeViewer for browsing (drilling down) through this graph. The nature of the model is such that the same model element can occur in multiple positions (paths) of the three. Current implementation of the TreeViewer and TableTreeViewer do not support such one-to-many mapping of model elements to widgets, leading to loads of unnecessary overhead to enshure that correct items will get updated. Suggestion: Element -> Item mapper should allow returning of more than one item per model element that is associated with this element.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
*/
	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();
	/**
	 * List of open listeners (element type:
	 * <code>ISelectionActivateListener</code>).