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
public void showBusy(boolean busy) {
		super.showBusy(busy);
		if (busy) {
			preBusyMarkers = totalMarkers;
		} else {
			if (totalMarkers != preBusyMarkers)
				getProgressService().warnOfContentChange();
		}
	}
	/**
	 * Create the UIJob used in the receiver for updates.
	 * 
	 */
	private void createUIJob() {
		countUpdateJob = new WorkbenchJob(
				MarkerMessages.MarkerView_refreshProgress) {
			public IStatus runInUIThread(IProgressMonitor monitor) {
				
				Tree tree = getTree();
				if (tree != null && !tree.isDisposed()) {
					updateStatusMessage();
					updateTitle();
					
					if (isHierarchalMode()
							&& getCurrentMarkers().getSize() < 20)
						getViewer().expandAll();
				}
				return Status.OK_STATUS;
			}
		};