POV-Ray : Documentation : Undo
  POV-Ray 3.6 Documentation Online View Clear Messages Redo Undo

This command, and the remaining ones, only appear if the current window is an editor window.

The Undo command 'undoes' (reverses or remedies) the last change made to the text. Consecutive Undo operations can be used to revert to earlier and earlier text. The editor keeps seperate Undo and Redo histories for each open file. Clear Messages Redo

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