mdocml: Fix a quirk with respect to empty .HP.

mdocml: Fix a quirk with respect to empty .HP.

[schwarze]

Log Message:
-----------
Fix a quirk with respect to empty .HP.
Found while writing a regression test for man_macro.c rev. 1.66.
Incidentally, this brings rendering of XFreeEventData(3) closer to groff.

Modified Files:
--------------
    mdocml:
        man_term.c

Revision Data
-------------
Index: man_term.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/man_term.c,v
retrieving revision 1.173
retrieving revision 1.174
diff -Lman_term.c -Lman_term.c -u -p -r1.173 -r1.174
--- man_term.c
+++ man_term.c
@@ -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;
--
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