Dotted-circle all marks, not just non-spacing, at text beginning

src/hb-ot-shape.cc

@@ -286,8 +286,7 @@ hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
 {
   if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
       buffer->context_len[0] ||
-      _hb_glyph_info_get_general_category (&buffer->info[0]) !=
-      HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
+      !_hb_glyph_info_is_unicode_mark (&buffer->info[0]))
     return;
 
   if (!font->has_glyph (0x25CCu))