277         List<string> prevText = new List<string>();  field in FastColoredTextBoxNS.ReplaceTextCommand
318                 InsertTextCommand.InsertText(prevText[prevText.Count - i - 1], ts);  in Undo()
335             prevText.Clear();  in Execute()
345                 prevText.Add(tb.Selection.Text);  in Execute()
475         List<string> prevText = new List<string>();  field in FastColoredTextBoxNS.ReplaceMultipleTextCommand
520                 InsertTextCommand.InsertText(prevText[prevTextIndex], ts);  in Undo()
534             prevText.Clear();  in Execute()
543                 prevText.Add(tb.Selection.Text);  in Execute()
566         List<string> prevText = new List<string>();  field in FastColoredTextBoxNS.RemoveLinesCommand
606                 var text = prevText[prevText.Count - i - 1];  in Undo()
628             prevText.Clear();  in Execute()
637                 prevText.Add(ts[iLine].Text);//backward  in Execute()