Bug 262877 The JavaModel object needs to be handled by the JavaNavigatorLabelProvider
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/navigator/resources/ProjectExplorer.java
* @see IWorkbenchPage#findView(String)
	 * @see IWorkbenchPage#findViewReference(String)
	 */
	public static final String VIEW_ID = "org.eclipse.ui.navigator.ProjectExplorer"; 
	/**
	 * @since 3.4
	 */
	public static final int WORKING_SETS = 0;
	/**
	 * @since 3.4
	 */
	public static final int PROJECTS = 1;
	private int rootMode;
	/**
	 * Used only in the case of top level = PROJECTS and only when some
	 * working sets are selected. 
	 */
	private String workingSetLabel;
	/**
	 * The superclass does not deal with the content description, handle it
	 * here.
	 * 
	 * @noreference
	 */
	public void updateTitle() {
		super.updateTitle();
		Object input = getCommonViewer().getInput();
		if (input == null || input instanceof IAggregateWorkingSet) {
			setContentDescription(""); 
			return;