Bug 127629 [Markers] problems view: keep selection stable
I20050214-0010 1. Select a grouping (e.g. Java problem type) and select a marker inside 2. Switch to another grouping Selection is gone. Same when - changing filter - a build adds new marker (in a different file)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ProblemView.java
private final static String[] ROOT_TYPES = { IMarker.PROBLEM };
	private final static String TAG_DIALOG_SECTION = "org.eclipse.ui.views.problem"; 
	private static final String TAG_SYSTEM_FILTER_ENTRY = "systemFilter";
	private ActionResolveMarker resolveMarkerAction;
	private IActivityManagerListener activityManagerListener;
	private IField severity = new FieldSeverity();
	private IField folder = new FieldFolder();
	private IField resource = new FieldResource();
	private IField message = new FieldMessage();
	private IField lineNumber = new FieldLineNumber();
	private IField creationTime = new FieldCreationTime();
	
	
	private static IField id = new FieldId();
	private class GroupingAction extends Action {
		IField groupingField;
		ProblemView problemView;
		/**
		 * Create a new instance of the receiver.
		 *