Bug 127289 [Markers] SystemFilter and group selection state not preserved
We are not preserving the selection state of the system filters or which group is selected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
* (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
			 */
			public void propertyChange(PropertyChangeEvent event) {
				clearEnabledFilters();
				refreshViewer();
			}
		};
		return workingSetListener;
	}
	/**
	 * Schedule an update of the markers
	 */
	void scheduleMarkerUpdate() {
		markerProcessJob.cancel();
		updateJob.cancel();
		updateJob.refreshAll();
		getProgressService().schedule(markerProcessJob, 100);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.TableView#createTree(org.eclipse.swt.widgets.Composite)
	 */
	protected Tree createTree(Composite parent) {
		Tree tree = super.createTree(parent);
		tree.addTreeListener(new TreeAdapter() {
			/*
			 * (non-Javadoc)