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
*            the item
	 * @param element
	 *            the element
	 */
	protected void updatePlus(Item item, Object element) {
		boolean hasPlus = getItemCount(item) > 0;
		boolean needsPlus = isExpandable(item, null, element);
		boolean removeAll = false;
		boolean addDummy = false;
		Object data = item.getData();
		if (data != null && equals(element, data)) {
			
			if (hasPlus != needsPlus) {
				if (needsPlus) {
					addDummy = true;
				} else {
					removeAll = true;
				}
			}
		} else {
			
			removeAll = true;
			addDummy = needsPlus;
			
			setExpanded(item, false);
		}
		if (removeAll) {
			
			Item[] items = getItems(item);
			for (int i = 0; i < items.length; i++) {