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
String message;
		if (newSelection == null || newSelection.size() == 0) {
			message = MarkerSupportInternalUtilities.EMPTY_STRING;
		} else if (newSelection.size() == 1) {
			
			message = ((MarkerSupportItem) newSelection.getFirstElement())
					.getDescription();
		} else {
			Iterator elements = newSelection.iterator();
			Collection result = new ArrayList();
			while (elements.hasNext()) {
				MarkerSupportItem next = (MarkerSupportItem) elements.next();
				if (next.isConcrete())
					result.add(next);
			}
			MarkerEntry[] entries = new MarkerEntry[result.size()];
			result.toArray(entries);
			
			message = getStatusSummary(entries);
		}
		getViewSite().getActionBars().getStatusLineManager()
				.setMessage(message);
	}
	/**
	 * Get the status line summary of markers.
	 * 
	 * @param entries
	 */
	private String getStatusSummary(MarkerEntry[] entries) {
		Integer[] counts = Markers.getMarkerCounts(entries);