Deviation case file #20230612: no-break `sp` request when not on a page

[G. Branden Robinson]

Here is your puzzler for the day.

Given this input:

'sp 2v
foo
.br
bar
'sp 2v
baz

...run through "nroff | cat -n", on what line numbers do "foo", "bar",
and "baz" appear?  Which *roff did you use?

If you want to skip ahead and see "the answer", visit
<https://savannah.gnu.org/bugs/?64300>.

The more entertaining question is: which implementation(s) are wrong?

Regards,
Branden

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