In .Bl -tag and -hang, do not print a margin-left style attribute

for each individual item if the -width argument matches the default
of 6n.  Suggested by Steffen Nurpmeso <steffen at sdaoden dot eu>
on <groff at GNU dot org> in April 2017.

3 files changed, 27 insertions, 20 deletions

diff --git a/html.c b/html.c
index c3a66b8e..1f1d8729 100644
--- a/html.c
+++ b/html.c
@@ -624,24 +624,28 @@ print_otag(struct html *h, enum htmltag tag, const char *fmt, ...)
 			su = va_arg(ap, struct roffsu *);
 			break;
 		case 'w':
-			if ((arg2 = va_arg(ap, char *)) == NULL) {
-				if (*fmt == '+')
-					fmt++;
-				if (*fmt == '-')
-					fmt++;
-				break;
+			if ((arg2 = va_arg(ap, char *)) != NULL) {
+				su = &mysu;
+				a2width(arg2, su);
+			}
+			if (*fmt == '*') {
+				if (su != NULL && su->unit == SCALE_EN &&
+				    su->scale > 5.9 && su->scale < 6.1)
+					su = NULL;
+				fmt++;
 			}
-			su = &mysu;
-			a2width(arg2, su);
 			if (*fmt == '+') {
-				/* Increase to make even bold text fit. */
-				su->scale *= 1.2;
-				/* Add padding. */
-				su->scale += 3.0;
+				if (su != NULL) {
+					/* Make even bold text fit. */
+					su->scale *= 1.2;
+					/* Add padding. */
+					su->scale += 3.0;
+				}
 				fmt++;
 			}
 			if (*fmt == '-') {
-				su->scale *= -1.0;
+				if (su != NULL)
+					su->scale *= -1.0;
 				fmt++;
 			}
 			break;
diff --git a/mandoc_html.3 b/mandoc_html.3
index d7c3f45a..6ec35cd9 100644
--- a/mandoc_html.3
+++ b/mandoc_html.3
@@ -231,12 +231,15 @@ nothing is printed for this pair.
 .Pp
 The
 .Cm w
-argument type letter can optionally be followed by one or two
+argument type letter can optionally be followed by one, two, or three
 modifier letters.
 The modifier
+.Cm *
+suppresses printing of the pair if the argument matches 6n.
+The modifier
 .Cm +
-increases the width by 10% to make even bold text fit
-and adds two units for padding between columns.
+increases the width by 20% to make even bold text fit
+and adds three units for padding between columns.
 The modifier
 .Cm \-
 makes the width negative by multiplying it with \-1.
diff --git a/mdoc_html.c b/mdoc_html.c
index 3ef5169e..7a972038 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -732,7 +732,7 @@ mdoc_it_pre(MDOC_ARGS)
 				print_otag(h, TAG_B, "c", cattr);
 			break;
 		case ROFFT_BODY:
-			print_otag(h, TAG_DD, "csw+l", cattr,
+			print_otag(h, TAG_DD, "csw*+l", cattr,
 			    bl->norm->Bl.width);
 			break;
 		default:
@@ -746,7 +746,7 @@ mdoc_it_pre(MDOC_ARGS)
 			    (n->parent->prev == NULL ||
 			     n->parent->prev->body == NULL ||
 			     n->parent->prev->body->child != NULL)) {
-				t = print_otag(h, TAG_DT, "csw+-l",
+				t = print_otag(h, TAG_DT, "csw*+-l",
 				    cattr, bl->norm->Bl.width);
 				print_text(h, "\\ ");
 				print_tagq(h, t);
@@ -754,7 +754,7 @@ mdoc_it_pre(MDOC_ARGS)
 				print_text(h, "\\ ");
 				print_tagq(h, t);
 			}
-			print_otag(h, TAG_DT, "csw+-l", cattr,
+			print_otag(h, TAG_DT, "csw*+-l", cattr,
 			    bl->norm->Bl.width);
 			break;
 		case ROFFT_BODY:
@@ -860,7 +860,7 @@ mdoc_bl_pre(MDOC_ARGS)
 	case LIST_tag:
 		if (bl->offs)
 			print_otag(h, TAG_DIV, "cswl", "Bl-tag", bl->offs);
-		print_otag(h, TAG_DL, "csw+l", bl->comp ?
+		print_otag(h, TAG_DL, "csw*+l", bl->comp ?
 		    "Bl-tag Bl-compact" : "Bl-tag", bl->width);
 		return 1;
 	case LIST_column: