Method Get():undo() Foundation
Resets the associated variable to the value held in :original.
:undo() --> self
:undo() returns a reference to the Get object.
When a Get object has input focus, this method assigns the value of :original to the associated variable by evaluating the data code block and passing :original as an argument. After updating the associated variable, :undo() calls :reset() to update the edit buffer, display the edit buffer, and position the cursor appropriately.
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