Bug 302791 [CommonNavigator] Associated editor does not close when deleting resource (editorInput) through CommonNavigator
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/LinkHelperDescriptor.java
private final IConfigurationElement configElement;
	private String id;
	private Expression editorInputEnablement;
	
	private Expression selectionEnablement;
	private boolean hasLinkHelperFailedCreation;
	LinkHelperDescriptor(IConfigurationElement aConfigElement) {
		Assert.isNotNull(aConfigElement,
				"LinkHelperRegistry.Descriptor objects cannot be null."); 
		Assert
				.isLegal(LINK_HELPER.equals(aConfigElement.getName()),