Unfortunately, without consuming more file space, and such, each undo action is placed into a buffer. This buffer can be called with the /redo command, but the buffer only lasts once per user. If you /undo more, it overwrites that buffer and in turn, the actions last made.
I will look for a solution with Redo, because it's quite poor at the moment. I don't think the buffer stores itself properly, and it doesn't fully redo actions. This flaw was inherited with MCLawl.
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