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
IStructuredSelection structured = (IStructuredSelection) selection;
		if (!Util.isSingleConcreteSelection(structured))
			return;
		menu.add(new Separator(MENU_SHOW_IN_GROUP));
		
		showInMenu = new MenuManager(IDEWorkbenchMessages.Workbench_showIn);
		showInMenu.add(ContributionItemFactory.VIEWS_SHOW_IN
				.create(getViewSite().getWorkbenchWindow()));
		menu.appendToGroup(MENU_SHOW_IN_GROUP, showInMenu);
	}
	/**
	 * Refresh the marker counts
	 * 
	 * @param monitor
	 */
	void refreshMarkerCounts(IProgressMonitor monitor) {
		monitor.subTask(MarkerMessages.MarkerView_refreshing_counts);
		try {
			totalMarkers = MarkerList.compute(getMarkerTypes()).length;
		} catch (CoreException e) {
			IDEWorkbenchPlugin.getDefault().getLog().log(e.getStatus());
			return;
		}
	}
	/**
	 * Schedule an update of the summary counts.
	 */
	public void scheduleCountUpdate() {
		if (countUpdateJob == null)
			createUIJob();