POV-Ray : Documentation : Redo
  POV-Ray 3.6 Documentation Online View Undo Cut Redo

Redoes the last change undone with Undo. Can only be used immediately following an Undo operation; editing the text will erase the Redo history. Consecutive Redo operations are possible if consecutive Undo operations were performed. The editor keeps seperate Undo and Redo histories for each open file. Undo Cut

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