Bug 287103 [CommonNavigator] contentServiceLabelProvider doesn't properly implement overrides
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
if (isDisposed)
			return;
		synchronized (this) {
			if (structuredViewerManager == null) {
				structuredViewerManager = new StructuredViewerManager((StructuredViewer) aViewer, this);
				structuredViewerManager.inputChanged(anOldInput, aNewInput);
			} else {
				structuredViewerManager.inputChanged(aViewer, anOldInput,
						aNewInput);
			}
			for (Iterator contentItr = contentExtensions.values().iterator(); contentItr
					.hasNext();) {
				NavigatorContentExtension ext = (NavigatorContentExtension) contentItr
						.next();
				if (ext.isLoaded()) {
					structuredViewerManager
							.initialize(ext.getContentProvider());
				}
			}
			rootContentProviders = extractContentProviders(findRootContentExtensions(aNewInput));
		}
	}
	public IExtensionStateModel findStateModel(String anExtensionId) {
		if (anExtensionId == null) {
			return null;
		}
		INavigatorContentDescriptor desc = CONTENT_DESCRIPTOR_REGISTRY