Bug 194209 [CommonNavigator] ProblemsLabelDecorator does not scale well with Project Explorer
When opening a project, The ProblemsLabelDecorator fires a LabelProviderChangedEvent for all resources contained in this project. While in a ProblemTreeViewer, like the Package Explorer, this is handled in an optimized way by filtering out updates to resources which are not realized in the tree view, the Common Navigator has no such means. The result is that for a project with e.g. 50000 resources, a label update for 50000 elements is triggered even though the project is not even expanded in the view.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
* <p>
 * This class provides the IViewPart for the Common Navigator framework in the
 * Eclipse workbench. This class also serves as the backbone for navigational
 * viewers. The following types are used by this class to render the Common
 * Navigator:
 * <ul>
 * <li>
 * <p>
 * {@link org.eclipse.ui.navigator.CommonViewer}: The viewer that renders the
 * extensible tree. Creates and manages the lifecycle of the Navigator Content
 * Service (described below).
 * </p>
 * </li>
 * <li>
 * <p>
 * {@link org.eclipse.ui.navigator.NavigatorActionService}: Manages instances
 * of {@link org.eclipse.ui.navigator.CommonActionProvider}s provided by
 * individual extensions and content extensions.
 * </p>
 * </li>
 * <li>
 * <p>
 * {@link org.eclipse.ui.navigator.INavigatorContentService}: Manages instances
 * of Navigator Content Extensions. Instances are created as needed, and
 * disposed of upon the disposal of the Navigator Content Service.
 * </p>
 * </li>
 * </ul>
 * <p>
 * Clients are not expected to subclass CommonNavigator. Clients that wish to