mandoc: Stop unconditionally emitting vertical space before .TS (table

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
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).

Modified Files:
--------------
    mandoc:
        man_term.c

Revision Data
-------------
Index: man_term.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/man_term.c,v
retrieving revision 1.240
retrieving revision 1.241
diff -Lman_term.c -Lman_term.c -u -p -r1.240 -r1.241
--- man_term.c
+++ man_term.c
@@ -951,7 +951,7 @@ 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:
--
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