ICSharpCode.AvalonEdit.Editing.LineNumberMargin.OnDocumentLineCountChanged C# (CSharp) Method

        void OnDocumentLineCountChanged()
        {
            int documentLineCount = Document != null ? Document.LineCount : 1;
            int newLength = documentLineCount.ToString(CultureInfo.CurrentCulture).Length;

            // The margin looks too small when there is only one digit, so always reserve space for
            // at least two digits
            if (newLength < 2)
                newLength = 2;

            if (newLength != maxLineNumberLength) {
                maxLineNumberLength = newLength;
                InvalidateMeasure();
            }
        }