1 files changed, 19 insertions, 3 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/AlternateSet.hh b/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/AlternateSet.hh
index 484f347468..b4466119be 100644
--- a/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/AlternateSet.hh
+++ b/src/3rdparty/harfbuzz-ng/src/OT/Layout/GSUB/AlternateSet.hh
@@ -5,12 +5,13 @@
 
 namespace OT {
 namespace Layout {
-namespace GSUB {
+namespace GSUB_impl {
 
+template <typename Types>
 struct AlternateSet
 {
   protected:
-  Array16Of<HBGlyphID16>
+  Array16Of<typename Types::HBGlyphID>
                 alternates;             /* Array of alternate GlyphIDs--in
                                          * arbitrary order */
   public:
@@ -56,8 +57,23 @@ struct AlternateSet
 
     if (unlikely (alt_index > count || alt_index == 0)) return_trace (false);
 
+    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+    {
+      c->buffer->sync_so_far ();
+      c->buffer->message (c->font,
+			  "replacing glyph at %u (alternate substitution)",
+			  c->buffer->idx);
+    }
+
     c->replace_glyph (alternates[alt_index - 1]);
 
+    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+    {
+      c->buffer->message (c->font,
+			  "replaced glyph at %u (alternate substitution)",
+			  c->buffer->idx - 1u);
+    }
+
     return_trace (true);
   }
 
@@ -68,7 +84,7 @@ struct AlternateSet
   {
     if (alternates.len && alternate_count)
     {
-      + alternates.sub_array (start_offset, alternate_count)
+      + alternates.as_array ().sub_array (start_offset, alternate_count)
       | hb_sink (hb_array (alternate_glyphs, *alternate_count))
       ;
     }