mandoc: More accurately represent cells containing horizontal lines in

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
More accurately represent cells containing horizontal lines in -T tree
output.  In particular, do not represent "_" as "-", and distinguish "_"
from "\_" and "=" from "\=".
Output tweak following a related question from
Ted Bullock <tbullock at comlore dot com>.

Modified Files:
--------------
    mandoc:
        tree.c

Revision Data
-------------
Index: tree.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/tree.c,v
retrieving revision 1.91
retrieving revision 1.92
diff -Ltree.c -Ltree.c -u -p -r1.91 -r1.92
--- tree.c
+++ tree.c
@@ -1,7 +1,7 @@
 /* $Id$ */
 /*
  * Copyright (c) 2008, 2009, 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2013-2015, 2017-2021 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2013-2015, 2017-2022 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -509,12 +509,16 @@ print_span(const struct tbl_span *sp, in
 					putchar('x');
 			}
 			switch (dp->pos) {
-			case TBL_DATA_HORIZ:
 			case TBL_DATA_NHORIZ:
-				putchar('-');
+				putchar('\\');
+				/* FALLTHROUGH */
+			case TBL_DATA_HORIZ:
+				putchar('_');
 				break;
-			case TBL_DATA_DHORIZ:
 			case TBL_DATA_NDHORIZ:
+				putchar('\\');
+				/* FALLTHROUGH */
+			case TBL_DATA_DHORIZ:
 				putchar('=');
 				break;
 			default:
--
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