Bug 59956 [R21PRES] perspective switcher
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
private String workspaceLocation = null;
	/**
	 * Ordered set of versioned feature ids new for this session; <code>null</code>
	 * if uninitialized. Element type: <code>String</code>
	 */
	private Set newlyAddedFeatures = null;
	
	/**
	 * List of <code>AboutInfo</code> for all new installed
	 * features that specify a welcome perspective.
	 */
	private ArrayList welcomePerspectiveInfos = null;
	
	/**
	 * Helper for managing activites in response to workspace changes.
	 */
	private IDEWorkbenchActivityHelper activityHelper = null;
	
	/**
	 * Signals that the welcome editors and/or intros have been opened.
	 */
	private boolean editorsAndIntrosOpened = false;
	
	/**
	 * Creates a new workbench advisor instance.
	 */
	protected IDEWorkbenchAdvisor() {
		super();
		if (workbenchAdvisor != null) {
			throw new IllegalStateException();