A space is inserted between two spans

[Wladimir-Panfilenko]

Describe the bug
For two consecutive spans there is an additional space inserted between them.

Expected behavior
Just the content of the two spans without the space.

Repro
<span>foo</span><span>bar</span>
In the browser:

In the docx:

In this example a single paragraph is generated that contains 3 runs. One run for each of the spans and one for the additional space.

Sample test for easier repro:

public class HtmlToOpenXmlTests
{
        [Fact]
        public void TwoSpans()
        {
            using var memoryStream = new MemoryStream();
            using var wordDocument = WordprocessingDocument.Create(memoryStream, DocumentFormat.OpenXml.WordprocessingDocumentType.Document, true);
            var mainPart = wordDocument.AddMainDocumentPart();
            mainPart.Document = new Document();
            mainPart.Document.AppendChild(new Body());

            var htmlConverter = new HtmlConverter(mainPart);
            var html = "<p><span>foo</span><span>bar</span></p>";
            var parsedElements = htmlConverter.Parse(html);

            var text = ((Paragraph)parsedElements[0]).InnerText;

            text.Should().Be("foobar"); // text is "foo bar" instead
        }
}