Bug 275910 [Widgets] PaintListener on Tree not invoked when item count is 0
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
private static int instanceCount = 1;
	private static final String TAG_GENERATOR = "markerContentGenerator"; 
	private static final String TAG_EXPANDED = "expanded"; 
	private static final String TAG_CATEGORY = "category"; 
	private static final String TAG_PART_NAME = "partName"; 
	private static final String TAG_COLUMN_WIDTHS = "columnWidths"; 
	private MarkerContentGenerator generator;
	private CachedMarkerBuilder builder;
	private Collection categoriesToExpand;
	private UIUpdateJob uiUpdateJob;
	
	private MarkersTreeViewer viewer;
	/**
	 * Tells whether the tree has been painted.
	 * @since 3.7
	 */
	private boolean treePainted= false;
	
	private ISelectionListener pageSelectionListener;
	private IPartListener2 partListener;
	private Clipboard clipboard;
	
	private IMemento memento;
	private String[] defaultGeneratorIds = new String[0];
	private UndoActionHandler undoAction;
	private RedoActionHandler redoAction;
	/**
	 * Return a new instance of the receiver.
	 *