===================================================================
RCS file: /cvs/mandoc/man_term.c,v
retrieving revision 1.173
retrieving revision 1.174
diff -u -p -r1.173 -r1.174
--- mandoc/man_term.c	2015/04/02 23:48:19	1.173
+++ mandoc/man_term.c	2015/04/04 11:44:43	1.174
@@ -1,4 +1,4 @@
-/*	$Id: man_term.c,v 1.173 2015/04/02 23:48:19 schwarze Exp $ */
+/*	$Id: man_term.c,v 1.174 2015/04/04 11:44:43 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2015 Ingo Schwarze <schwarze@openbsd.org>
@@ -533,6 +533,17 @@ post_HP(DECL_ARGS)
 	switch (n->type) {
 	case ROFFT_BODY:
 		term_newln(p);
+
+		/*
+		 * Compatibility with a groff bug.
+		 * The .HP macro uses the undocumented .tag request
+		 * which causes a line break and cancels no-space
+		 * mode even if there isn't any output.
+		 */
+
+		if (n->child == NULL)
+			term_vspace(p);
+
 		p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
 		p->trailspace = 0;
 		p->offset = mt->offset;