Bug 89031 [Undo/Redo] IWorkbench#getOperationSupport() marked experimental
IWorkbench#getOperationSupport() marked experimental
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
/**
	 * Perform the redo. All validity checks have already occurred.
	 * 
	 * @param monitor
	 * @param operation
	 */
	protected IStatus doRedo(IProgressMonitor monitor, IAdaptable info, IUndoableOperation operation,
			boolean flushOnError) throws ExecutionException{
		IStatus status = getRedoApproval(operation, info);
		if (status.isOK()) {
			notifyAboutToRedo(operation);
			try {
				status = operation.redo(monitor, info);
			} catch (OperationCanceledException e) {
				status = Status.CANCEL_STATUS;
			} catch (ExecutionException e) {
				notifyNotOK(operation);
				if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
					System.out.print("OPERATIONHISTORY >>> ExecutionException while redoing ");  
					System.out.print(operation);
					System.out.println();
				}
				throw e;
			} catch (Exception e) {
				notifyNotOK(operation);
				if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
					System.out.print("OPERATIONHISTORY >>> Exception while redoing ");  
					System.out.print(operation);
					System.out.println();
				}