Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (isSameSelection(items, current)) {
			return;
		}
		TreeItem[] newItems = new TreeItem[items.size()];
		items.toArray(newItems);
		getTree().setSelection(newItems);
	}
	/**
	 * Returns <code>true</code> if the given list and array of items refer to
	 * the same model elements. Order is unimportant.
	 * 
	 * @param items
	 *            the list of items
	 * @param current
	 *            the array of items
	 * @return <code>true</code> if the refer to the same elements,
	 *         <code>false</code> otherwise
	 * 
	 * @since 3.1
	 */
	protected boolean isSameSelection(List items, Item[] current) {
		
		int n = items.size();
		if (n != current.length) {
			return false;
		}
		CustomHashtable itemSet = newHashtable(n * 2 + 1);
		for (Iterator i = items.iterator(); i.hasNext();) {
			Item item = (Item) i.next();