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
WorkbenchActionBuilder actionBuilder = null;
		IWorkbenchWindowConfigurer windowConfigurer = getWorkbenchConfigurer().getWindowConfigurer(window);
		
		
		
		actionBuilder = (WorkbenchActionBuilder) windowConfigurer.getData(ACTION_BUILDER);
		if (actionBuilder == null) {
			actionBuilder = new WorkbenchActionBuilder(window);
		}
		
		if ((flags & FILL_PROXY) != 0) {
			
			if ((flags & FILL_MENU_BAR) != 0) {
				actionBuilder.populateMenuBar(actionConfigurer);
			}
			if ((flags & FILL_COOL_BAR) != 0) {
				actionBuilder.populateCoolBar(actionConfigurer);
			}
		} else {
			
			
			windowConfigurer.setData(ACTION_BUILDER,actionBuilder);
			actionBuilder.makeAndPopulateActions(getWorkbenchConfigurer(), actionConfigurer);
		}
		
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.application.WorkbenchAdvisor#getMainPreferencePageId
	 */