FastColoredTextBoxNS.ClearSelectedCommand.Undo C# (CSharp) Method

        public override void Undo()
        {
            ts.CurrentTB.Selection.Start = new Place(sel.FromX, Math.Min(sel.Start.iLine, sel.End.iLine));
            ts.OnTextChanging();
            InsertTextCommand.InsertText(deletedText, ts);
            ts.OnTextChanged(sel.Start.iLine, sel.End.iLine);
            ts.CurrentTB.Selection.Start = sel.Start;
            ts.CurrentTB.Selection.End = sel.End;
        }