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
}
			rootContentProviders = extractContentProviders(findRootContentExtensions(aNewInput));
		}
	}
	public IExtensionStateModel findStateModel(String anExtensionId) {
		if (anExtensionId == null) {
			return null;
		}
		INavigatorContentDescriptor desc = CONTENT_DESCRIPTOR_REGISTRY
				.getContentDescriptor(anExtensionId);
		if (desc == null) {
			return null;
		}
		INavigatorContentExtension ext = getExtension(desc);
		if (ext == null) {
			return null;
		}
		return ext.getStateModel();
	}
	/**
	 * Return a set of content providers that could provide a parent for the
	 * given element. These content extensions are determined by consulting the
	 * <b>possibleChildren</b> expression in the <b>navigatorContent</b>
	 * extension.
	 * 
	 * <p>
	 * Clients that wish to tap into the link with editor support must describe
	 * all of their possible children in their <b>possibleChildren</b>
	 * expressions.
	 * </p>