Currently, the hyperlink is exported not as hyperlink text only but additionally, all the field data is included.

Steps to reproduce:

1. Insert a hyperlink to the RadFlowDocument: 

   editor.InsertHyperlink(text:"telerik", uri:"http://www.telerik.com", isAnchor:false, toolTip:"Telerik site");

2. Export to plain text using the TxtFormatProvider.

Actual:  HYPERLINK "http://www.telerik.com" \o "Telerik site" Telerik
Expected: Telerik

Workaround:

IEnumerable<Run> runs = document.EnumerateChildrenOfType<Run>();
foreach (Run run in runs.ToList())
{
	if (run.Text.Trim().StartsWith("HYPERLINK"))
	{
		run.Paragraph.Inlines.Remove(run);
	}
}