Bug 208055 [Markers] Need a sorting method for the markers view
As there is currently no accessible way to change sort order or direction. A menu should be enough.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
filterGroup, IResource.DEPTH_INFINITE, subMonitor);
			break;
		}
		case MarkerFieldFilterGroup.ON_WORKING_SET: {
			findMarkers(returnMarkers, getResourcesInWorkingSet(), filterGroup,
					IResource.DEPTH_INFINITE, subMonitor);
		}
		}
	}
	/**
	 * Adds all markers in the given set of resources to the given list
	 * 
	 * @param results
	 *            The Collection to add new entries to
	 * @param resources
	 * @param group
	 *            the group to filter on. May be <code>null</code>.
	 * @param depth
	 * @param monitor
	 */
	private void findMarkers(Collection results, IResource[] resources,
			MarkerFieldFilterGroup group, int depth, IProgressMonitor monitor) {
		if (resources == null) {
			return;
		}
		
		
		Collection selectedTypes = getMarkerTypes();
		
		HashSet typesToSearch = new HashSet(selectedTypes.size());