Nested list spacing issue

[Steffen Nurpmeso <sdaoden@yandex.com>]

Hello,

I'm sure it's known but i can't find a TODO entry in cvs(1) HEAD:
suppose this

  .Sh TABLE OF CONTENTS
  .Bl -inset
  .It Sx "DESCRIPTION"
  .Bl -tag -offset indent
  .It Sx "Creating a table of contents"
  ...
  .El
  ...
  .El

In groff v1.22.3 you will see

  TABLE OF CONTENTS
       DESCRIPTION

             Creating a table of contents

but in mandoc v1.13.1 you get

  TABLE OF CONTENTS
       DESCRIPTION
             Creating a table of contents

which i think lacks an initial vertical space when the .Bl is
opened?  A different approach could be found below, but i don't
know if it's always like that (and am too lazy to evaluate).

--steffen

diff --git a/mandoc.1 b/mandoc.1
index 19c90f6..838ea51 100644
--- a/mandoc.1
+++ b/mandoc.1
@@ -1572,6 +1572,7 @@ macro in
 .Fl T Ns Cm ascii
 does not assert a prior vertical break, just as it doesn't with
 .Sq \&Sh .
+Likewise the first item of a nested list won't assert a vertical break.
 .It
 The
 .Sq \&na
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