Bug 120736 [Markers] NPE during: "Fetching children of Problems".
[I20051213-0010, Windows XP] I can only reproduce this in my inner workspace, not in the outer one. It happens when I selected "New Window" and then close the new window immediately. java.lang.NullPointerException at org.eclipse.ui.views.markers.internal.MarkerView.scheduleCountUpdate(MarkerView.java:1432) at org.eclipse.ui.views.markers.internal.MarkerAdapter.fetchDeferredChildren(MarkerAdapter.java:201) at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:192) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
*/
	protected String updateSummarySelected(IStructuredSelection selection) {
		
		return MessageFormat.format(
				MarkerMessages.marker_statusSummarySelected,
				new Object[] { new Integer(selection.size()) });
	}
	/**
	 * @return the update summary
	 */
	protected String updateSummaryVisible() {
		return ""; 
	}
	/**
	 * Open a dialog on the filters
	 * 
	 */
	public final void openFiltersDialog() {
		DialogMarkerFilter dialog = createFiltersDialog();
		if (dialog.open() == Window.OK) {
			MarkerFilter[] result = dialog.getFilters();
			if (result == null)
				return;
			if (result.length == 0)
				setFilters(new MarkerFilter[] { createFilter(MarkerMessages.MarkerFilter_defaultFilterName) });
			else
				setFilters(result);
			updateForFilterChanges();
			refreshFilterMenu();
			getViewer().refresh();