undoNestedGroup()
Performs the undo operations in the last undo group (whether top-level or nested), recording the operations on the redo stack as a single group.
Declaration
func undoNestedGroup()Discussion
Raises an NSInternalInconsistencyException if any undo operations have been registered since the last enableUndoRegistration() message.
This method posts an NSUndoManagerCheckpoint and NSUndoManagerWillUndoChange before it performs the undo operation, and it posts an NSUndoManagerDidUndoChange after it performs the undo operation.