Bug 275929 [CommonNavigator] IPipelinedTreeContentProvider.getPipelinedElements() not ever called
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
.findContentExtensionsByTriggerPoint(anElement);
		NavigatorContentExtension ext;
		for (Iterator itr = resultInstances.iterator(); itr.hasNext();) {
			ext = (NavigatorContentExtension) itr.next();
			if (!ext.isLoaded() && !enforceHasChildren)
				return true;
			ITreeContentProvider cp = ext.internalGetContentProvider();
			if (cp instanceof ITreePathContentProvider) {
				ITreePathContentProvider tpcp = (ITreePathContentProvider) cp;
				if (tpcp.hasChildren(path)) {
					return true;
				}
			} else if (cp.hasChildren(anElement))
				return true;
		}
		return false;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreePathContentProvider#getParents(java.lang.Object)
	 */
	public TreePath[] getParents(Object anElement) {
		
		List paths = new ArrayList();
		TreePathCompiler compiler = new TreePathCompiler(anElement); 
		Set compilers = findPaths(compiler);
		for (Iterator iter = compilers.iterator(); iter.hasNext();) {
			TreePathCompiler c = (TreePathCompiler) iter.next();
			paths.add(c.createParentPath());
			
		}