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
public synchronized void listen() {
			if (!listening) {
				PlatformUI.getWorkbench().getWorkingSetManager().addPropertyChangeListener(managerChangeListener);
				listening = true;
			}
		}
		/**
		 * Begin listening to the correct source if not already listening.
		 */
		public synchronized void ignore() {
			if (listening) {
				PlatformUI.getWorkbench().getWorkingSetManager().removePropertyChangeListener(managerChangeListener);
				listening = false;
			}
		}
	}
	private IPropertyChangeListener filterChangeListener = new IPropertyChangeListener() {
		/*
		 * (non-Javadoc)
		 *
		 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
		 */
		public void propertyChange(PropertyChangeEvent event) {
			IWorkingSet newWorkingSet = (IWorkingSet) event.getNewValue();
			if (newWorkingSet != null && !contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
				contentService.getActivationService().activateExtensions(new String[]{WorkingSetsContentProvider.EXTENSION_ID}, false);
				contentService.getActivationService().persistExtensionActivations();
			}
			setWorkingSet(newWorkingSet);
		}