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/TreeViewer.java
*/
	private TreeEditorImpl treeViewerImpl;
	/**
	 * This viewer's control.
	 */
	private Tree tree;
	/**
	 * This viewer's tree editor.
	 */
	private TreeEditor treeEditor;
	/**
	 * The color and font collector for the cells.
	 */
	private TreeColorAndFontCollector treeColorAndFont = new TreeColorAndFontCollector();
	/**
	 * Creates a tree viewer on a newly-created tree control under the given
	 * parent. The tree control is created using the SWT style bits
	 * <code>MULTI, H_SCROLL, V_SCROLL,</code> and <code>BORDER</code>. The
	 * viewer has no input, no content provider, a default label provider, no
	 * sorter, and no filters.
	 * 
	 * @param parent
	 *            the parent control
	 */
	public TreeViewer(Composite parent) {
		this(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
	}
	/**
	 * Creates a tree viewer on a newly-created tree control under the given
	 * parent. The tree control is created using the given SWT style bits. The