Bug 89031 [Undo/Redo] IWorkbench#getOperationSupport() marked experimental
IWorkbench#getOperationSupport() marked experimental
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/IOperationHistory.java
* before and after any operation is executed, undone or redone. Notification of
 * operation execution only occurs when clients direct the history to execute
 * the operation. If the operation is added after it is executed, there can be
 * no notification of its execution.
 * </p>
 * <p>
 * IOperationApprover defines an interface for approving an undo or redo before
 * it occurs. This is useful for injecting policy-decisions into the model -
 * whether direct undo and redo are supported, or warning the user about certain
 * kinds of operations. It can also be used when objects have state related to
 * the operation and need to determine whether an undo or redo will cause any
 * conflicts with their local state.
 * </p>
 * <p>
 * Note: This class/interface is part of a new API under development. It has
 * been added to builds so that clients can start using the new features.
 * However, it may change significantly before reaching stability. It is being
 * made available at this early stage to solicit feedback with the understanding
 * that any code that uses this API may be broken as the API evolves.
 * </p>
 * 
 * @since 3.1
 * @experimental
 */
public interface IOperationHistory {
	/**
	 * An operation is to be opened or closed for execution.
	 */
	public static final int EXECUTE = 0x0001;
	/**