Bug 275929 [CommonNavigator] IPipelinedTreeContentProvider.getPipelinedElements() not ever called
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
.getId() }), e);
			}
		}
		return finalChildrenSet.toArray();
	}
	/**
	 * Query each of <code>theOverridingExtensions</code> for children, and
	 * then pipe them through the Pipeline content provider.
	 * 
	 * @param aParentOrPath
	 *            The parent element in the tree
	 * @param theOverridingExtensions
	 *            The set of overriding extensions that should participate in
	 *            the pipeline chain
	 * @param theCurrentChildren
	 *            The current children to return to the viewer (should be
	 *            modifiable)
	 * @return The set of children to return to the viewer
	 */
	private ContributorTrackingSet pipelineChildren(Object aParentOrPath,
			NavigatorContentExtension[] theOverridingExtensions,
			ContributorTrackingSet theCurrentChildren) {
		IPipelinedTreeContentProvider pipelinedContentProvider;
		NavigatorContentExtension[] overridingExtensions;
		ContributorTrackingSet pipelinedChildren = theCurrentChildren;
		for (int i = 0; i < theOverridingExtensions.length; i++) {
			
			pipelinedChildren.setContributor((NavigatorContentDescriptor) theOverridingExtensions[i].getDescriptor());				
			if (theOverridingExtensions[i].getContentProvider() instanceof IPipelinedTreeContentProvider) {
				pipelinedContentProvider = (IPipelinedTreeContentProvider) theOverridingExtensions[i]