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/workingsets/WorkingSetsContentProvider.java
private int rootMode = WORKING_SETS;
	private IExtensionStateModel extensionStateModel;	
	private IPropertyChangeListener rootModeListener = new IPropertyChangeListener() {
		
		/* (non-Javadoc)
		 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
		 */
		public void propertyChange(PropertyChangeEvent event) {
			if(SHOW_TOP_LEVEL_WORKING_SETS.equals(event.getProperty())) {
				updateRootMode();
			}
			
		} 
	};
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.ICommonContentProvider#init(org.eclipse.ui.navigator.ICommonContentExtensionSite)
	 */  
	public void init(ICommonContentExtensionSite aConfig) {
		extensionStateModel = aConfig.getExtensionStateModel(); 
		extensionStateModel.addPropertyChangeListener(rootModeListener);
		updateRootMode();
		
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.IMementoAware#restoreState(org.eclipse.ui.IMemento)
	 */
	public void restoreState(IMemento aMemento) { 
		
	}