[bug #63695] [mm] omits vertical space after inside address in LT letters

[G. Branden Robinson]

Update of bug #63695 (project groff):

                  Status:                    None => In Progress            
             Assigned to:                    None => gbranden               
                 Summary: [mm] omits vertical space after salutation in LT
letters => [mm] omits vertical space after inside address in LT letters

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Follow-up Comment #2:

This problem turns out to be a little more general.  It can be observed even
if _no_ letter options are used.


$ cat EXPERIMENTS/simple-letter.mm
.ND "17 May 2023"
.WA "Epi G. Netic" "Head of Research"
123 Main Street
Anytown, ST  10101
.WE
.IA "Rufus T. Arbogast" "Guru"
456 Elsewhere Avenue
Nirvana, PA  20406
.IE
.LT
.P
We have a research leak!
.FC
.SG
.NS
sundry careless people
.NE
$ nroff -mm EXPERIMENTS/simple-letter.mm|cat -s # groff 1.22.4

                                     123 Main Street
                                     Anytown, ST  10101
                                     17 May 2023

       Rufus T. Arbogast
       Guru
       456 Elsewhere Avenue
       Nirvana, PA  20406
       We have a research leak!

                                     Yours very truly,

                                     Epi G. Netic
                                     Head of Research

       Copy to
       sundry careless people



The problem is that there should be an unconditional `sp` request at the very
end of the `let@print-head` macro, and there isn't.


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