Bug 214649 [Markers] Allow markerAttributeGroupings and markerGroups to be specified within contentGenerators
With everything at the top level it is hard to see the relation to a contentGenerator and the groups and attribute groupings. These should be sub elements a la menus.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerContentGenerator.java
break;
		}
		case MarkerFieldFilterGroup.ON_WORKING_SET: {
			findMarkers(returnMarkers, getResourcesInWorkingSet(filterGroup
					.getWorkingSet()), filterGroup, IResource.DEPTH_INFINITE,
					subMonitor);
		}
		}
	}
	/**
	 * Add all of the markers that pass the filters to results.
	 * 
	 * @param results
	 *            Collection of {@link IMarker}
	 * @param group
	 * @param markers
	 */
	private void filterMarkers(Collection results,
			MarkerFieldFilterGroup group, IMarker[] markers) {
		for (int idx = 0; idx < markers.length; idx++) {
			IMarker marker = markers[idx];
			if (group == null || group.select(marker))
				results.add(marker);
		}
	}
	/**
	 * Iterate through the return markers. If they do not exist in matching
	 * remove them.
	 * 
	 * @param matching