anchor.diff:          
       let getClassificationSpans (newSnapshotSpan: SnapshotSpan) =
           match fastState.Value with
  -        | FastStage.Data { FastStageData.Snapshot = snapshot; Spans = spans } ->
  +        | FastStage.Data { FastStageData.Snapshot = snapshot; Spans = spans }
  +        | FastStage.Updating (Some { FastStageData.Snapshot = snapshot; Spans = spans }, _) ->
               // We get additional 10 lines above the current snapshot in case the user inserts some line
               // while we were getting locations from FCS. It's not as reliable though. 
               let spanStartLine = max 0 (newSnapshotSpan.Start.GetContainingLine().LineNumber + 1 - 10)
  
positive.code:                         let origSnapshot = columnSpan.Snapshot |> Option.getOrElse snapshot
                          let! span = fromRange origSnapshot (columnSpan.WordSpan.ToRange())
                          // Translate the span to the new snapshot
                          return clType, span.TranslateTo(newSnapshotSpan.Snapshot, SpanTrackingMode.EdgeExclusive) 
                      })
                  |> Seq.takeWhile (fun (_, span) -> span.Start.GetContainingLine().LineNumber <= spanEndLine)
                  |> Seq.map (fun (clType, span) -> ClassificationSpan(span, clType))
  
negative.code:         | FastStage.NoData -> 
              // Only schedule an update on signature files
              if isSignatureExtension(Path.GetExtension(textDocument.FilePath)) then
                  // If not yet schedule an action, do it now. 
                  updateSyntaxConstructClassifiers false
              [||]
          | FastStage.Updating _ -> [||]
  