Bug 214492 [Markers] Need to be able to add filters to existing markers views
Currently you can only add filters to a new markerContentProvider. We need to able to bind them to existing markerContentProviders as well.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.views.markers.MarkerSupportInternalUtilities;
import org.eclipse.ui.views.markers.MarkerField;
import org.eclipse.ui.views.markers.MarkerItem;
import org.eclipse.ui.views.markers.MarkerSupportConstants;
/**
 * @since 3.2
 * 
 */
public class MarkerGroup {
	class AttributeMapping extends EntryMapping {
		String attribute;
		String attributeValue;
		AttributeMarkerGrouping grouping;
		/**
		 * Create a mapping for an attribute with name attributeName and value
		 * value to the supplied entry.
		 * 
		 * @param entry
		 * @param attributeName
		 * @param value
		 */
		AttributeMapping(MarkerGroupingEntry entry, String attributeName,
				String value, AttributeMarkerGrouping grouping) {
			super(entry);
			attribute = attributeName;
			attributeValue = value;
			this.grouping = grouping;
		}
		/*