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
updateJob.addJobChangeListener(listener);
	}
	/**
	 * Remove a listener for the end of the update.
	 * 
	 * @param listener
	 */
	public void removeUpdateFinishListener(IJobChangeListener listener) {
		updateJob.removeJobChangeListener(listener);
	}
	
	/**
	 * Create a listener for working set changes.
	 * @return IPropertyChangeListener
	 */
	private IPropertyChangeListener getWorkingSetListener() {
		workingSetListener = new IPropertyChangeListener(){
			/* (non-Javadoc)
			 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
			 */
			public void propertyChange(PropertyChangeEvent event) {
				clearEnabledFilters();
				getViewer().refresh();
				
			}
		};
		return workingSetListener;
	}
}