These are unsupported commands, and I gave you a workable method to do what has not been supported or documented. Just use the BeginCommand("Script") exactly as shown, with the string "Script" as the argument. If you try use the undo command outside of the Begin/EndCommand, you'll get an error:
Cannot undo or redo when a command is being executed.
The Begin/EndCommand allows it to halt the GUI mouse/keyboard event loop to do the command and then start the event loop again. Use the script as shown or you will run into problems.
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