Bug 85452 [IDE] (regression) Backdrop missing when all perspectives closed
I20050215-2300 - close all perspectives - the main page is blank - it should have a backdrop with text and button explaining how to open a perspective
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
* session; <code>null</code> if uninitialized. Key type:
     * <code>String</code>, Value type: <code>AboutInfo</code>.
     */
    private Map newlyAddedBundleGroups;
    /**
     * Array of <code>AboutInfo</code> for all new installed
     * features that specify a welcome perspective.
     */
    private AboutInfo[] welcomePerspectiveInfos = null;
    /**
     * Helper for managing activites in response to workspace changes.
     */
    private IDEWorkbenchActivityHelper activityHelper = null;
    /**
     * 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
     */
    public void initialize(IWorkbenchConfigurer configurer) {
        
        configurer.setSaveAndRestore(true);