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
* properties, elements may appear or disappear if the change affects
	 * whether or not they are filtered out.
	 * </p>
	 * 
	 * @param elements
	 *            the elements
	 * @param properties
	 *            the properties that have changed, or <code>null</code> to
	 *            indicate unknown
	 */
	public void update(Object[] elements, String[] properties) {
		for (int i = 0; i < elements.length; ++i)
			update(elements[i], properties);
	}
	/**
	 * Updates the given element's presentation when one or more of its
	 * properties changes. Only the given element is updated.
	 * <p>
	 * This does not handle structural changes (e.g. addition or removal of
	 * elements), and does not update any other related elements (e.g. child
	 * elements). To handle structural changes, use the <code>refresh</code>
	 * methods instead.
	 * </p>
	 * <p>
	 * This should be called when an element has changed in the model, in order
	 * to have the viewer accurately reflect the model. This method only affects
	 * the viewer, not the model.
	 * </p>
	 * <p>
	 * Specifying which properties are affected may allow the viewer to optimize