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
private static final String TAG_FILTERS_SECTION = "filterGroups"; 
	private static final String TAG_GROUP_ENTRY = "filterGroup"; 
	private static final Object VALUE_FALSE = "false"; 
	private static final String TAG_AND = "andFilters"; 
	private MarkerField[] allFields;
	private MarkerGroup categoryGroup;
	private IConfigurationElement configurationElement;
	private Collection enabledFilters;
	private Collection filters;
	private IResource[] focusResources = MarkerSupportInternalUtilities.EMPTY_RESOURCE_ARRAY;
	private Collection markerTypes;
	private MarkerField[] visibleFields;
	private IWorkingSet workingSet;
	private boolean andFilters = false;
	private MarkerComparator comparator;
	private IMemento memento;
	/**
	 * Create a new MarkerContentGenerator
	 * 
	 * @param element
	 */
	public MarkerContentGenerator(IConfigurationElement element) {
		configurationElement = element;
	}
	/**
	 * Add the resources in resourceMapping to the resourceCollection
	 * 
	 * @param resourceCollection
	 * @param resourceMapping
	 */