errored rendering of <u> elements in PDF

[alicerusso]

Describe the issue

scrambled rendering of <u> elements in the PDF. (HTML and TXT are ok.) see A) https://www.rfc-editor.org/v3test/test9639_A.png (scrambled order and text is missing; this is from p. 62 of the PDF below) vs. B) https://www.rfc-editor.org/v3test/test9639_B.png (correct order. only change was to text in <t> from "as follows:" to "xx xxxxxxx:")

Line break location relative to RTL character in the PDF seems to be a factor.

files: https://www.rfc-editor.org/v3test/test9639v8.xml https://www.rfc-editor.org/v3test/test9639v8.pdf (page 62)

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