Bug 65762 [Viewers] Need to back out of change to AbstractTreeViewer.isExpandable
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/viewsupport/ProblemTreeViewer.java
*/
	public ProblemTreeViewer(Composite parent) {
		super(parent);
		initMapper();
	}
	/*
	 * @see TreeViewer#TreeViewer(Composite, int)
	 */
	public ProblemTreeViewer(Composite parent, int style) {
		super(parent, style);
		initMapper();
	}
	/*
	 * @see TreeViewer#TreeViewer(Tree)
	 */
	public ProblemTreeViewer(Tree tree) {
		super(tree);
		initMapper();
	}
	
	private void initMapper() {
		fResourceToItemsMapper= new ResourceToItemsMapper(this);
	}
	
	
	/*
	 * @see StructuredViewer#mapElement(Object, Widget)
	 */
	protected void mapElement(Object element, Widget item) {
		super.mapElement(element, item);