Bug 275929 [CommonNavigator] IPipelinedTreeContentProvider.getPipelinedElements() not ever called
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
NavigatorContentExtension[] overridingExtensions;
		for (Iterator itr = rootContentExtensions.iterator(); itr.hasNext();) {
			foundExtension = (NavigatorContentExtension) itr.next();
			try {
				if (!isOverridingExtensionInSet(foundExtension.getDescriptor(),
						rootContentExtensions)) {
					contributedChildren = foundExtension.internalGetContentProvider()
							.getElements(anInputElement);
					
					localSet.setContents(contributedChildren);
					overridingExtensions = foundExtension
							.getOverridingExtensionsForTriggerPoint(anInputElement);
					if (overridingExtensions.length > 0) { 
						localSet = pipelineChildren(anInputElement,
								overridingExtensions, localSet);						
					}
					finalElementsSet.addAll(localSet);
				}
			} catch (RuntimeException re) {
				NavigatorPlugin
						.logError(
								0,
								NLS
										.bind(
												CommonNavigatorMessages.Could_not_provide_children_for_element,
												new Object[] { foundExtension
														.getDescriptor()
														.getId() }), re);
			} catch (Error e) {
				NavigatorPlugin