Bug 181061 [Viewers] JFace viewers performance issues in 3.3
A number of the JFace performance tests are red since I20060926-0800.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
* @return <code>true</code> if the refer to the same elements,
	 *         <code>false</code> otherwise
	 * 
	 * @since 3.1 in TreeViewer, moved to AbstractTreeViewer in 3.3
	 */
	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();
			Object element = item.getData();
			itemSet.put(element, element);
		}
		
		
		for (int i = 0; i < current.length; i++) {
			if (current[i].getData() == null
					|| !itemSet.containsKey(current[i].getData())) {
				return false;
			}
		}
		return true;
	}