IndexOutOfRange exception in StringExtensions.TrimFirstLine

System.IndexOutOfRangeException occurred
  StackTrace:
       at System.Text.StringBuilder.get_Chars(Int32 index)
       at ExCSS.Model.Extensions.StringExtensions.TrimFirstLine(StringBuilder builder)
       at ExCSS.StyleSheet.ToString(Boolean friendlyFormat, Int32 indentation)
       at ExCSS.StyleSheet.ToString()

public static StringBuilder TrimFirstLine(this StringBuilder builder)
        {
            if (builder.Length > 0) // this check must be moved to "while"
            {
                while (builder[0] == '\r' || builder[0] == '\n' || builder[0] == '\t')
                {
                    builder.Remove(0, 1);
                }
            }

            return builder;
        }

[MaceWindu]

Well, I was testing different inputs and it was failing like that on latest released version on empty string (string.Empty). On current code base it doesn’t fail due to some other changes since last release, so I have no inputs to reproduce it now using parser. But you still can reproduce it using isolated test for this extension method (and TrimLastLine):

new StringBuilder("\r\n").TrimLastLine();
new StringBuilder("\r\n").TrimFirstLine();

[TylerBrinks]

Looking into it.