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
};
	private WorkingSetManagerListener managerChangeListener = new WorkingSetManagerListener();
	private IExtensionActivationListener activationListener = new IExtensionActivationListener() {
		private IWorkingSet savedWorkingSet;
		public void onExtensionActivation(String aViewerId, String[] theNavigatorExtensionIds, boolean isActive) {
			for (int i = 0; i < theNavigatorExtensionIds.length; i++) {
				if (WorkingSetsContentProvider.EXTENSION_ID.equals(theNavigatorExtensionIds[i])) {
					if (isActive) {
						extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);
						workingSetRootModeActionGroup.setStateModel(extensionStateModel);
						extensionStateModel.addPropertyChangeListener(topLevelModeListener);
						if (savedWorkingSet != null) {
							setWorkingSet(savedWorkingSet);
							workingSetActionGroup.setWorkingSet(savedWorkingSet);
						}
						managerChangeListener.listen();
					} else {
						savedWorkingSet= workingSet;
						setWorkingSet(null);
						managerChangeListener.ignore();
						workingSetActionGroup.setWorkingSet(null);
						workingSetRootModeActionGroup.setShowTopLevelWorkingSets(false);
						extensionStateModel.removePropertyChangeListener(topLevelModeListener);
					}
				}
			}
		}
	};
	/*
	 * (non-Javadoc)