public static ITrackingSpan RangeToTrackingSpan(vsrange vsrange, ITextSnapshot textSnapshot)
 {
     var from = vsrange.From;
     ITextSnapshotLine anchor = textSnapshot.GetLineFromLineNumber(from.Line);
     var start = anchor.Start.Position;
     var to = vsrange.To;
     var end = textSnapshot.GetLineFromLineNumber(to.Line).Start.Position + to.Col;
     return textSnapshot.CreateTrackingSpan(start, end - start, SpanTrackingMode.EdgeInclusive);
 }
 public void MoveTo(vsrange range, ITextSnapshot currentSnapshot)
 {
     Span = RangeToTrackingSpan(range, currentSnapshot);
 }