EditAddUndo(<-undoType)

Creates an undo entry when editing the map. The argument specifies the type of undo. A value of 0 means any terrain change.
Only undoType of 0 (zero) is supported.
An undo entry can be restored by the map maker while in edit mode by pressing CTRL+Z.
This command does nothing when the editor is not currently active. (Enabled/disabled via Shift+E).

Do note that you should use this API before applying a terrain change, not after.

EditAddUndo(0) #--Add an undo state (before changing terrain).
SetTerrain(42 23 10) #--Apply terrain change.
#--The terrain change is now part of the undo state and can be undone by the map maker via CTRL/command-z.

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