> I believe this is a misunderstanding due to the inherent ambiguity of
> "undo" in this context.  The text wants to say that you cannot undo
> the effect in the repository, not in the buffer that visits the file.

Hello Eli, thanks for your quick answer.

I'm not fully convinced, though.  It isn't clear to me why is worth
mentioning undo commands, if the text isn't about undoing changes
in the buffer itself.

Best regards,
Mauro.