title: Merging two RTFs in UWP
body: <p>I have two strings (RTFs), that I'd have to merge somehow - <em>insert a new line between the two</em> -, to display in a RichEditBox, in UWP. I have read a workaround where merging the two is done by the usage of two RichTextBox controls, but in UWP, that's not really an option (and I can't display the two RTFs in two RichEditBox controls either). Is there an alternative way, without using 3rd party libraries?</p>