anchor.diff:          match character with
           | 'd' -> Some Delete
           | 'c' -> Some Change
  +        | 'v' -> Some Visual
           | _ -> None
   
       let keys = ResizeArray<_>()
  
positive.code:         | Delete -> 
              x.Editor.SetSelection(start, finish)
              ClipboardActions.Cut textEditorData
          | _ -> ()
  
      override x.Initialize() =
  
negative.code: 
  type CommandType =
      | Move
      | Visual
      | Delete
      | Change
      | DoNothing
  