Don't deserialize positions if buffer has no positions

src/hb-buffer-serialize.cc

@@ -282,6 +282,9 @@ hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
   assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
 	  buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
 
+  if (!buffer->have_positions)
+    flags |= HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS;
+
   if (unlikely (start == end))
     return 0;
 

src/hb-ot-layout.cc

@@ -1020,8 +1020,6 @@ inline void hb_ot_map_t::apply (const Proxy &proxy,
 				  buf, sizeof (buf), NULL,
 				  font,
 				  HB_BUFFER_SERIALIZE_FORMAT_TEXT,
-				  Proxy::table_index == 0 ?
-				  HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS :
 				  HB_BUFFER_SERIALIZE_FLAG_DEFAULT);
       printf ("buf: [%s]\n", buf);
 #endif