when IgnoreWhitespace, XmlDiffDocument doesn't ignore it

[bill2004158]

Sample xml:

<a>
  <b>2</b>
</a>

between the element <a> & <b>, there is Text element which content is "\n ".
as IgnoreWhitespace, which should be ignored.

however, it will be trimmed, and add as a child node.
https://github.com/lovettchris/xmldiff/blob/master/src/XmlDiff/XmlDiffDocument.cs#L173

case XmlNodeType.Text:
{
   string textValue = ( _XmlDiff.IgnoreWhitespace ) ? XmlDiff.NormalizeText( reader.Value ) : reader.Value;
   XmlDiffCharData charDataNode = new XmlDiffCharData( ++childPosition, textValue, XmlDiffNodeType.Text );
   charDataNode.ComputeHashValue( _xmlHash );
   InsertChild( parent, charDataNode );
   break;
}

if compare with this xml (IgnoreWhitespace):

<a><b>2</b></a>

because they have different child nodes,
they will have different HashValue,
as a result, xmlDiff.Compare() will return false.

[bill2004158]

https://github.com/lovettchris/xmldiff/blob/master/src/XmlDiff/XmlDiffDocument.cs#L150

 if ( reader.NodeType == XmlNodeType.Whitespace )

it will ignore the whitespace node.
but NOT the Text node whose text is whitespace.

If the xml is parsed using System.Xml.Linq.XDocument, which prase it as Text node, rather than Whitespace node.
the code to replicate this issue:

static void Main(string[] args)
{
    var xml1 = """
                <a><c>                                                                                            </c>
                    <b>a</b>
                </a>
               """;
    var xml2 = """<a><c/><b>a</b></a> """;

    var x1 = XDocument.Load(new StringReader(xml1), LoadOptions.PreserveWhitespace);
    var x2 = XDocument.Load(new StringReader(xml2), LoadOptions.PreserveWhitespace);

    var compareOption = XmlDiffOptions.IgnoreWhitespace
                        | XmlDiffOptions.IgnoreChildOrder
                        | XmlDiffOptions.IgnoreNamespaces
                        | XmlDiffOptions.IgnoreComments;
    var xmlDiff = new XmlDiff(compareOption);

    var diff = xmlDiff.Compare(x1.CreateReader(), x2.CreateReader());

    Console.WriteLine(diff);
}