[bug #64267] [man] missing blank line before section heading after empty paragraph in PD 0/IP/PD sequence

[G. Branden Robinson]

Update of bug #64267 (group groff):

                  Status:               Confirmed => In Progress            
             Assigned to:                    None => gbranden               

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Follow-up Comment #2:

Exhibit:


$ cat EXPERIMENTS/monsters.man 
.TH foo 1 2024-03-15 "groff test suite"
.SH Name
foo \- frobnicate a bar
.SH Monsters
In this game reminiscent of
.IR rogue (6),
you can expect to encounter the following opponents in increasing order
of menace.
.
.PD 0
.IP B
bat
.IP T
troll
.P
.PD \" inexpert page author didn't put this _before_ the `P` call
.SH Treasure
There's a lot of it.


_groff_ output (at least 1.22.3 to present, possibly forever):


$ ~/groff-1.22.3/bin/nroff -man EXPERIMENTS/monsters.man | cat -s
foo(1)                      General Commands Manual                    
foo(1)

Name
       foo - frobnicate a bar

Monsters
       In  this  game reminiscent of rogue(6), you can expect to encounter
the
       following opponents in increasing order of menace.
       B      bat
       T      troll
Treasure
       There's a lot of it.

groff test suite                  2024-03-15                           
foo(1)


For our amusement, _groff_ using the Seventh Edition Unix _man_ macros:


$ nroff -C -M ./HISTORY/MAN/1979-01-v7 -manv7 -man EXPERIMENTS/monsters.man |
cat -s

foo(1)               UNIX Programmer’s Manual              foo(1)

Name
     foo − frobnicate a bar

Monsters
     In this game reminiscent of rogue(6), you can expect to
     encounter the following opponents in increasing order of
     menace.
     B    bat
     T    troll

Treasure
     There’s a lot of it.

Printed 3/15/124            2024‐03‐15                          1





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