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
*            which are expanded
	 * @param widget
	 *            the widget
	 */
	private void internalSetExpandedTreePaths(
			CustomHashtable expandedTreePaths, Widget widget,
			TreePath currentPath) {
		Item[] items = getChildren(widget);
		for (int i = 0; i < items.length; i++) {
			Item item = items[i];
			Object data = item.getData();
			TreePath childPath = data == null ? null : currentPath
					.createChildPath(data);
			if (data != null && childPath != null) {
				
				
				boolean expanded = expandedTreePaths.remove(childPath) != null;
				if (expanded != getExpanded(item)) {
					if (expanded) {
						createChildren(item);
					}
					setExpanded(item, expanded);
				}
			}
			internalSetExpandedTreePaths(expandedTreePaths, item, childPath);
		}
	}
	/**
	 * Return whether the tree node representing the given element or path can
	 * be expanded. Clients should query expandablity by path if the viewer's