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.

1 files changed, 11 insertions, 0 deletions

diff --git a/man_term.c b/man_term.c
index 473b25e4..d0dd4263 100644
--- a/man_term.c
+++ b/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;