Bug 161738 [Undo] - API - promote ability to quietly compute status to operations API
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/AbstractWorkspaceOperation.java
implements IAdvancedUndoableOperation, IAdvancedUndoableOperation2 {
	private static String ELLIPSIS = "..."; 
	protected static int EXECUTE = 1;
	protected static int UNDO = 2;
	protected static int REDO = 3;
	protected IResource[] resources;
	private boolean isValid = true;
	/*
	 * Specifies whether any user prompting is appropriate while computing
	 * status.
	 */
	protected boolean quietCompute = false;