Bug 209667 [Markers] Add a TODO filter
We should be able to just focus on the TODOs in the tasks list.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/DescriptionFieldFilter.java
static final String TAG_CONTAINS_MODIFIER = "containsModifier"; 
	static final String TAG_CONTAINS_TEXT = "containsText"; 
	static String DOES_NOT_CONTAIN = "DOES_NOT_CONTAIN"; 
	String containsModifier = CONTAINS;
	String containsText = MarkerSupportConstants.EMPTY_STRING;
	/**
	 * Create a new instance of the receiver.
	 */
	public DescriptionFieldFilter() {
		super();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerFieldFilter#loadSettings(org.eclipse.ui.IMemento)
	 */
	public void loadSettings(IMemento memento) {
		String modifier = memento.getString(TAG_CONTAINS_MODIFIER);
		if(modifier == null)
			return;
		String contains = memento.getString(TAG_CONTAINS_TEXT);
		if(contains == null)
			return;
		containsText = contains;
		containsModifier = modifier;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerFieldFilter#saveSettings(org.eclipse.ui.IMemento)
	 */
	public void saveSettings(IMemento memento) {
		memento.putString(TAG_CONTAINS_MODIFIER, containsModifier);
		memento.putString(TAG_CONTAINS_TEXT, containsText);