Bug 156883 [Viewers] enhancements to ILazyTreeContentProvider
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
return;
		}
		if (!(getContentProvider() instanceof ILazyTreeContentProvider)) {
			return;
		}
		ILazyTreeContentProvider lazyTreeContentProvider = (ILazyTreeContentProvider) getContentProvider();
		int index;
		Widget parent = treeItem.getParentItem();
		if (parent == null) {
			parent = treeItem.getParent();
		}
		Object parentElement = parent.getData();
		if (parentElement != null) {
			if (parent instanceof Tree) {
				index = ((Tree) parent).indexOf(treeItem);
			} else {
				index = ((TreeItem) parent).indexOf(treeItem);
			}
			lazyTreeContentProvider.updateElement(parentElement, index);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#internalRefreshStruct(org.eclipse.swt.widgets.Widget,
	 *      java.lang.Object, boolean)
	 */
	protected void internalRefreshStruct(Widget widget, Object element,
			boolean updateLabels) {