Bug 275929 [CommonNavigator] IPipelinedTreeContentProvider.getPipelinedElements() not ever called
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
overridingExtensions = foundExtension
							.getOverridingExtensionsForTriggerPoint(aParentElement);
					
					localSet.setContents(contributedChildren);
					if (overridingExtensions.length > 0) {
												
						localSet = pipelineChildren(aParentElement,
								overridingExtensions, localSet);
					}
					finalChildrenSet.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
						.logError(
								0,
								NLS
										.bind(
												CommonNavigatorMessages.Could_not_provide_children_for_element,
												new Object[] { foundExtension
														.getDescriptor()