mandoc: In HTML output, correctly render .Bd -unfilled in

mandoc: In HTML output, correctly render .Bd -unfilled in

[schwarze]

Log Message:
-----------
In HTML output, correctly render .Bd -unfilled in proportionally-spaced 
font, rather than with the monospace font appropriate for .Bd -literal.
This fixes a minibug reported by anton@.

Implemented by no longer relying on the typical browser default of
"pre { font-family: monospace }" but instead letting <pre> elements 
inherit the font family from their parent, then adding an explicit CSS .Li
class only for those displays where the manual page author requested it
by using the -literal option on the .Bd macro.

Modified Files:
--------------
    mandoc:
        mandoc.css
        mdoc_html.c
    mandoc/regress/mdoc/Bd:
        paragraph.out_html

Revision Data
-------------
Index: mandoc.css
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.css,v
retrieving revision 1.47
retrieving revision 1.48
diff -Lmandoc.css -Lmandoc.css -u -p -r1.47 -r1.48
--- mandoc.css
+++ mandoc.css
@@ -31,6 +31,7 @@ td {		vertical-align: top;
 ul, ol, dl {	margin-top: 0em;
 		margin-bottom: 0em; }
 li, dt {	margin-top: 1em; }
+pre {		font-family: inherit; }
 
 .permalink {	border-bottom: thin dotted;
 		color: inherit;
Index: mdoc_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_html.c,v
retrieving revision 1.341
retrieving revision 1.342
diff -Lmdoc_html.c -Lmdoc_html.c -u -p -r1.341 -r1.342
--- mdoc_html.c
+++ mdoc_html.c
@@ -1,6 +1,6 @@
 /* $Id$ */
 /*
- * Copyright (c) 2014-2020 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2014-2021 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -930,7 +930,7 @@ mdoc_sx_pre(MDOC_ARGS)
 static int
 mdoc_bd_pre(MDOC_ARGS)
 {
-	char			 buf[16];
+	char			 buf[20];
 	struct roff_node	*nn;
 	int			 comp;
 
@@ -966,6 +966,9 @@ mdoc_bd_pre(MDOC_ARGS)
 	if (n->norm->Bd.offs != NULL &&
 	    strcmp(n->norm->Bd.offs, "left") != 0)
 		(void)strlcat(buf, " Bd-indent", sizeof(buf));
+
+	if (n->norm->Bd.type == DISP_literal)
+		(void)strlcat(buf, " Li", sizeof(buf));
 
 	print_otag_id(h, TAG_DIV, buf, n);
 	return 1;
Index: paragraph.out_html
===================================================================
RCS file: /home/cvs/mandoc/mandoc/regress/mdoc/Bd/paragraph.out_html,v
retrieving revision 1.6
retrieving revision 1.7
diff -Lregress/mdoc/Bd/paragraph.out_html -Lregress/mdoc/Bd/paragraph.out_html -u -p -r1.6 -r1.7
--- regress/mdoc/Bd/paragraph.out_html
+++ regress/mdoc/Bd/paragraph.out_html
@@ -7,7 +7,7 @@
 </div>
 back to normal
 <p class="Pp">another paragraph</p>
-<div class="Bd Pp" id="unfilled">
+<div class="Bd Pp Li" id="unfilled">
 <pre><a class="permalink" href="#unfilled">unfilled</a> literal
 display
 <mark id="upara"></mark>
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