Bug 57454 "show intro" preference not saved until shutdown
M8 As a general rule of thumb, if a plug-in changes a preference value then it should save it immediately. (or when the user hits OK/Apply in the prefs page, etc etc) When you start M8 and close the Intro page, I noticed that the ui.ide preferences are not saved until the workbench is shutdown.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
private static final String ACTION_BUILDER = "ActionBuilder"; 
	private static final String WELCOME_EDITOR_ID = "org.eclipse.ui.internal.ide.dialogs.WelcomeEditor"; 
	private static final String WORKBENCH_PREFERENCE_CATEGORY_ID = "org.eclipse.ui.preferencePages.Workbench"; 
	/**
	 * The dialog setting key to access the known installed features
	 * since the last time the workbench was run.
	 */
	private static final String INSTALLED_FEATURES = "installedFeatures"; 
	
	private static IDEWorkbenchAdvisor workbenchAdvisor = null;
	/**
	 * Event loop exception handler for the advisor.
	 */
	private IDEExceptionHandler exceptionHandler = null;
	
	/**
	 * Contains the workspace location if the -showlocation command line
	 * argument is specified, or <code>null</code> if not specified.
	 */
	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