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.resources/src/org/eclipse/ui/navigator/resources/ProjectExplorer.java
* Provides a constant for the standard instance of the Common Navigator.
	 * 
	 * @see PlatformUI#getWorkbench()
	 * @see IWorkbench#getActiveWorkbenchWindow()
	 * @see IWorkbenchWindow#getActivePage()
	 * 
	 * @see IWorkbenchPage#findView(String)
	 * @see IWorkbenchPage#findViewReference(String)
	 */
	public static final String VIEW_ID = "org.eclipse.ui.navigator.ProjectExplorer"; 
	/**
	 * @since 3.4
	 */
	public static final int WORKING_SETS = 0;
	/**
	 * @since 3.4
	 */
	public static final int PROJECTS = 1;
	private int rootMode;
	/**
	 * Used only in the case of top level = PROJECTS and only when some
	 * working sets are selected. 
	 */
	private String workingSetLabel;
	/**
	 * The superclass does not deal with the content description, handle it
	 * here.
	 * 
	 * @noreference
	 */