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

src/hb-ot-shape.cc

diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index dc88fa9..0cea9c6 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -286,8 +286,7 @@
 {
   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))