Bug 55799 [Intro] When new welcome is available, don't show the old one
One of the M8 candidate builds (any): 1) Open Eclipse on a new workspace 2) Close the new Welcome when it opens 3) Close Eclipse 4) Open Eclipse again. Observe: the old Welcome editor is opened. Expectation: when a product has a valid Intro, old welcome should never be shown.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
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();
		}
		workbenchAdvisor = this;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.application.WorkbenchAdvisor#initialize