Bug 172019 [Viewers] Plus sign doesn't disappear when using deferred content providers
3.3 M4 Use a tree viewer with a content provider using IDeferredWorkbenchAdapter and DeferredTreeContentManager. When fetchDeferredChildren is call and no elements are reported to the element collector the plus sign of the node doesn't disappear. This work without problems under Windows and Mac/OS (e.g. the plus sign disappears).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
* </p>
	 * 
	 * @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 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;
			}