Stop unconditionally emitting vertical space before .TS (table start).

Same change as in groff commit 7ec36dc9 Jul 30 2022 gbranden@
For more details, see https://savannah.gnu.org/bugs/index.php?62841

This change makes sense because:
* It improves the formatting of more pages than it degrades.
* Existing manual pages are wildly inconsistent in which behaviour they
expect: apparently few manual page authors understood the old rules.
* It simplifies the rules of how .TS behaves in man(7)
and makes them more similar to how it behaves in mdoc(7).
* It improves flexibility, making it possible for a table to immediately
follow preceding text without a blank line, which some existing pages
want to use, for example XCreateWindow(3).

diff --git a/usr.bin/mandoc/man_term.c b/usr.bin/mandoc/man_term.c
index 2ab9f78..10fc859 100644 (file)
--- a/usr.bin/mandoc/man_term.c
+++ b/usr.bin/mandoc/man_term.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: man_term.c,v 1.193 2022/08/16 17:44:53 schwarze Exp $ */
+/* $OpenBSD: man_term.c,v 1.194 2022/08/28 09:55:58 schwarze Exp $ */
 /*
  * Copyright (c) 2010-2015,2017-2020,2022 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -949,7 +949,7 @@ print_man_node(DECL_ARGS)
                return;
        case ROFFT_TBL:
                if (p->tbl.cols == NULL)
-                       term_vspace(p);
+                       term_newln(p);
                term_tbl(p, n->span);
                return;
        default: