Performs the operations in the last group on the redo stack, if there are any, recording them on the undo stack as a single group.
- iOS 3.0+
- macOS 10.0+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
NSInternal if the method is invoked during an undo operation.
This method posts an
NSUndo before it performs the redo operation, and it posts the
NSUndo after it performs the redo operation.