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
return;
		}
	
		IWorkbenchWindow win = window;
		if (perspectiveId != null) {
			try {
				win = getWorkbenchConfigurer().getWorkbench().openWorkbenchWindow(perspectiveId, getDefaultPageInput());
				if (win == null) {
					win = window;
				}
			} catch (WorkbenchException e) {
				IDEWorkbenchPlugin.log("Error opening window with welcome perspective.", e.getStatus()); 
				return;
			}
		}
	
		if (win == null) {
			win = getWorkbenchConfigurer().getWorkbench().getWorkbenchWindows()[0];
		}
			
		IWorkbenchPage page = win.getActivePage();
		String id = perspectiveId;
		if (id == null) {
			id = getWorkbenchConfigurer().getWorkbench().getPerspectiveRegistry().getDefaultPerspective();
		}
	
		if (page == null) {
			try {