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
*
	 * @see org.eclipse.ui.navigator.CommonActionProvider#init(org.eclipse.ui.navigator.ICommonActionExtensionSite)
	 */
	public void init(ICommonActionExtensionSite aSite) {
		viewer = aSite.getStructuredViewer();
		contentService = aSite.getContentService();
		extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);
		workingSetActionGroup = new WorkingSetFilterActionGroup(aSite.getViewSite().getShell(), filterChangeListener);
		workingSetRootModeActionGroup = new WorkingSetRootModeActionGroup(viewer, extensionStateModel);
		topLevelModeListener= new IPropertyChangeListener() {
			public void propertyChange(PropertyChangeEvent event) {
				setWorkingSet(workingSet);
			}};
		if (contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
			managerChangeListener.listen();
			extensionStateModel.addPropertyChangeListener(topLevelModeListener);
		}
		contentService.getActivationService().addExtensionActivationListener(activationListener);
	}
    /**
     * Restores the working set filter from the persistence store.
     */
    protected void initWorkingSetFilter(String workingSetName) {
        IWorkingSet workingSet = null;
        if (workingSetName != null && workingSetName.length() > 0) {
			IWorkingSetManager workingSetManager = PlatformUI.getWorkbench().getWorkingSetManager();
			workingSet = workingSetManager.getWorkingSet(workingSetName);
		} else if (PlatformUI.getPreferenceStore().getBoolean(
						IWorkbenchPreferenceConstants.USE_WINDOW_WORKING_SET_BY_DEFAULT)) {