public void OnTextChange(object sender, TextContentChangedEventArgs args)
{
List <TextChangeData> changeData = new List <TextChangeData>();
foreach (var change in args.Changes)
{
changeData.Add(new TextChangeData(change.OldPosition, change.Delta, Math.Max(change.NewSpan.Length, change.OldSpan.Length)));
}
_bufferTextChangeHandler.OnTextChanged(changeData);
}