Bug 208101 [Markers] Tasks content has mark completed enabled for non editable tasks
I20071030-0100 Mark completed is enabled for tasks that are not editable
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
status = ((CoreException) status.getException())
							.getStatus();
				}
				if (status == null)
					StatusManager.getManager().handle(
							StatusUtil.newStatus(IStatus.ERROR, e.getMessage(),
									e), StatusManager.SHOW);
				else
					StatusManager.getManager().handle(status,
							StatusManager.SHOW);
			}
		}
	}
	private CachedMarkerBuilder builder;
	Collection categoriesToExpand = new HashSet();
	private Clipboard clipboard;
	Collection preservedSelection = new ArrayList();
	private Job updateJob;
	private TreeViewer viewer;
	private IPropertyChangeListener preferenceListener;
	private IMemento memento;
	/**
	 * Return a new instance of the receiver.
	 */
	public ExtendedMarkersView() {
		super();
		instanceCount++;
		preferenceListener = new IPropertyChangeListener() {
			/*
			 * (non-Javadoc)