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/internal/navigator/NavigatorContentService.java
ExtensionPriorityComparator.INSTANCE);
		if (toRespectViewerRoots
				&& viewerDescriptor.hasOverriddenRootExtensions()) {
			NavigatorContentDescriptor[] descriptors = CONTENT_DESCRIPTOR_REGISTRY
					.getAllContentDescriptors();
			NavigatorContentExtension extension = null;
			for (int i = 0; i < descriptors.length; i++) {
				if (isActive(descriptors[i].getId())
						&& isRootExtension(descriptors[i].getId())) {
					extension = getExtension(descriptors[i]);
					if (!extension.hasLoadingFailed()) {
						rootExtensions.add(extension);
					}
				}
			}
		}
		if (rootExtensions.isEmpty()) {
			return findContentExtensionsByTriggerPoint(anElement);
		}
		return rootExtensions;
	}
	/**
	 * Search for extensions that declare the given element in their
	 * <b>triggerPoint</b> expression.
	 * 
	 * @param anElement
	 *            The element to use in the query
	 * @return The set of {@link INavigatorContentExtension}s that are
	 *         <i>visible</i> and <i>active</i> for this content service and
	 *         have a <b>triggerPoint</b> expression that is <i>enabled</i>