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/IDEWorkbenchWindowAdvisor.java
private static final String WELCOME_EDITOR_ID = "org.eclipse.ui.internal.ide.dialogs.WelcomeEditor"; 
    private IDEWorkbenchAdvisor wbAdvisor;
    private boolean editorsAndIntrosOpened = false;
    /**
     * Crates a new IDE workbench window advisor.
     *  
     * @param wbAdvisor the workbench advisor
     * @param configurer the window configurer
     */
    public IDEWorkbenchWindowAdvisor(IDEWorkbenchAdvisor wbAdvisor, IWorkbenchWindowConfigurer configurer) {
        super(configurer);
        this.wbAdvisor = wbAdvisor;
    }
    /* (non-Javadoc)
     * @see org.eclipse.ui.application.WorkbenchWindowAdvisor#createActionBarAdvisor(org.eclipse.ui.application.IActionBarConfigurer)
     */
    public ActionBarAdvisor createActionBarAdvisor(IActionBarConfigurer configurer) {
        return new WorkbenchActionBuilder(configurer);
    }
    
    /**
     * Returns the workbench.
     * 
     * @return the workbench