Bug 305703 [Viewers][CommonNavigator] remembered contributions can leak when using filters
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
}
			});
		}
		if (structuredViewerManager != null) {
			structuredViewerManager.resetViewerData();
		}
		update();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.INavigatorContentService#update()
	 */
	public void update() {
		rootContentProviders = null;
		if (structuredViewerManager != null) {
			structuredViewerManager.safeRefresh();
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.internal.navigator.INavigatorContentService#getViewerId()
	 */
	public final String getViewerId() {
		return viewerDescriptor.getViewerId();
	}
	/**
	 * Returns the remembered data (the NavigatorContentDescriptor) associated with