Some text nodes not present in tree after parsing - seems to be mixed content with formatted xml

```
func Test_MyTest(t *testing.T) {
	assert := assert.New(t)
	inputHtml := `
	<a>
	  <b>hello</b>
		my friend
  </a>`

	topNode, _ := xmlquery.Parse(strings.NewReader(inputHtml))

      //  `my friend` should be a sibling with <b> or a child of <a> but it is neither and unobtainable from the tree structure
}
```