~~NOTOC~~
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====== EditAddUndo ======
EditAddUndo(<-undoType)

===== Description =====
Creates an undo entry when editing the map.  The argument specifies the type of undo. A value of 0 means any terrain change.
An undo entry can be restored by the map maker, by pressing ctrl/command-z.
This command does nothing if the game is not in mission edit mode.

Note: Only undoType of 0 (zero) is supported.

===== Examples =====
<code 4rpl>
EditAddUndo(0)
SetTerrain(42 23 10)
#The make can press ctrl-z to under the terrain change.
</code>
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