Thanks for the patch. It was partially applied, leaving the overlong lines alone, as I do not see harm in them:
https://git.savannah.gnu.org/cgit/nano.git/commit/?id=8e456bab (Some similar issues in nano.1 were fixed too.)
["test-groff" is a script in the repository for "groff"; is not shipped]
That's too much trouble -- if I can't `apt install` it, I won't bother. Benno
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