Roll harfbuzz-ng to 1.0.5

third_party/harfbuzz-ng/src/hb-ot-shape-complex-hangul.cc

 /*
  * Copyright © 2013  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 187 matching lines @@
        * We could cache the width of the tone marks and the existence of dotted-circle,
        * but the use of the Hangul tone mark characters seems to be rare enough that
        * I didn't bother for now.
        */
       if (start < end && end == buffer->out_len)
       {
         /* Tone mark follows a valid syllable; move it in front, unless it's zero width. */
         buffer->next_glyph ();
         if (!is_zero_width_char (font, u))
         {
+          buffer->merge_out_clusters (start, end + 1);
           hb_glyph_info_t *info = buffer->out_info;
           hb_glyph_info_t tone = info[end];
           memmove (&info[start + 1], &info[start], (end - start) * sizeof (hb_glyph_info_t));
           info[start] = tone;
-          buffer->merge_out_clusters (start, end + 1);
         }
       }
       else
       {
         /* No valid syllable as base for tone mark; try to insert dotted circle. */
         if (font->has_glyph (0x25CCu))
         {
           hb_codepoint_t chars[2];
           if (!is_zero_width_char (font, u)) {
             chars[0] = u;
@@ skipping 191 matching lines @@
   data_create_hangul, /* data_create */
   data_destroy_hangul, /* data_destroy */
   preprocess_text_hangul,
   HB_OT_SHAPE_NORMALIZATION_MODE_NONE,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_hangul, /* setup_masks */
   HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
   false, /* fallback_position */
 };