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
path = getTreePathFromItem(item);
				}
				if (path == null) {
					path = new TreePath(new Object[] { element });
				}
			}
			return tpcp.hasChildren(path);
		}
		if (cp instanceof ITreeContentProvider) {
			ITreeContentProvider tcp = (ITreeContentProvider) cp;
			return tcp.hasChildren(element);
		}
		return false;
	}
	/**
	 * Return whether the given element is expandable.
	 * 
	 * @param item
	 *            the tree item for the element
	 * @param parentPath
	 *            the parent path if it is knwon or <code>null</code> if it
	 *            needs to be determines
	 * @param element
	 *            the element
	 * @return whether the given element is expandable
	 */
	private boolean isExpandable(Item item, TreePath parentPath, Object element) {
		Object elementOrTreePath = element;
		if (isTreePathContentProvider()) {
			if (parentPath != null) {