Bug 189490 [CommonNavigator] Go To->Resource won't enable
I0524 1. Open the Project Explorer in the Resource perspective 2. Create a vanilla project P 3. Create a folder F 4. Create a file resource R Open the Navigate->Go To file. "Resource..." will remain disabled.
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/internal/navigator/resources/actions/WorkingSetActionProvider.java
import org.eclipse.ui.navigator.INavigatorContentService;
/**
 * @since 3.2
 *
 */
public class WorkingSetActionProvider extends CommonActionProvider {
	private static final String TAG_CURRENT_WORKING_SET_NAME = "currentWorkingSetName"; 
	private boolean contributedToViewMenu = false;
	private StructuredViewer viewer;
	private INavigatorContentService contentService;
	private WorkingSetFilterActionGroup workingSetActionGroup;
	private WorkingSetRootModeActionGroup workingSetRootModeActionGroup;
	private Object originalViewerInput = ResourcesPlugin.getWorkspace().getRoot();
	private IExtensionStateModel extensionStateModel;
	private final ResourceWorkingSetFilter workingSetFilter = new ResourceWorkingSetFilter();
	private boolean filterAdded;
	private boolean emptyWorkingSet;
	private IWorkingSet workingSet;
	private IPropertyChangeListener topLevelModeListener;
	/**
	 * Provides a smart listener to monitor changes to the Working Set Manager.
	 *
	 */
	public class WorkingSetManagerListener implements IPropertyChangeListener {
		private boolean listening = false;
		/*
		 * (non-Javadoc)
		 *
		 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
		 */