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/src/org/eclipse/ui/navigator/CommonNavigator.java
.getSaveablesService().init(this, getCommonViewer(),
						saveablesLifecycleListener);
		
		commonViewer.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				firePropertyChange(PROP_DIRTY);
			}});
		
	      PlatformUI.getWorkbench().getHelpSystem().setHelp(commonViewer.getControl(),  HELP_CONTEXT);
	}
	/**
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this
	 * method.
	 * </p>
	 * <p>
	 * This method will be invoked when the DisposeListener is notified of the
	 * disposal of the Eclipse view part.
	 * </p>
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#dispose()
	 */
	public void dispose() {
		if (commonManager != null) {
			commonManager.dispose();
		}
		if(commonActionGroup != null) {
			commonActionGroup.dispose();
		}
		super.dispose();