[Groff] MM's nested lists: AL inside BVL

[Anton Shepelev]

Hello all,

Nested lists work well in MM most of the time, but I
have just found a situation wherein MM seems to have
a problem:

   .de TP
   ..
   .de EOP
   ..
   .PGFORM 40n 20v 0u
   .BVL 2
   .LI "Correct:"
   This item looks ok.
   .AL
   .LI
   One
   .LE
   .LI "Incorrect:"
   After .AL, our BVL list has broken.
   .LE

Here's the result:

   Correct:
     This item looks ok.

       1.  One

   Incorrect: After  .AL,  our BVL list has
     broken.

Note: The  same  example  runs  off  well  if .AL be
      changed to antoher list style, like .DL.

Anton