Bug 299438 [CommonNavigator] CNF viewer state non properly reset when NCEs are activated or deactivated
The map of the objects to the NCEs should be reset whenever the NCEs associated with the viewer to change to avoid having stale label information. This has shown up when looking at the CNF tests that change the viewer.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.navigator.INavigatorContentService#getFilterService()
	 */
	public INavigatorPipelineService getPipelineService() {
		if (navigatorPipelineService == null) {
			navigatorPipelineService = new NavigatorPipelineService(this);
		}
		return navigatorPipelineService;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.navigator.INavigatorContentService#getDnDService()
	 */
	public INavigatorDnDService getDnDService() {
		if (navigatorDnDService == null) {
			navigatorDnDService = new NavigatorDnDService(this);
		}
		return navigatorDnDService;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.navigator.INavigatorContentService#getActivationService()
	 */
	public INavigatorActivationService getActivationService() {