From bc80e4b9231ccb90746cebde24a7f24653b5a45a Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sun, 24 Jul 2022 18:48:38 -0600
Subject: [PATCH] [GSUB/GPOS] More buffer message for contextuals

Fixes https://github.com/harfbuzz/harfbuzz/issues/3753
---
 src/hb-ot-layout-gsubgpos.hh | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 5acd228b8..81075d6a3 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -1602,9 +1602,29 @@ static inline void apply_lookup (hb_ot_apply_context_t *c,
     if (unlikely (buffer->max_ops <= 0))
       break;
 
+    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+    {
+      if (buffer->have_output)
+        c->buffer->sync_so_far ();
+      c->buffer->message (c->font,
+			  "recursing to lookup %u at %d",
+			  (unsigned) lookupRecord[i].lookupListIndex,
+			  buffer->idx);
+    }
+
     if (!c->recurse (lookupRecord[i].lookupListIndex))
       continue;
 
+    if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+    {
+      if (buffer->have_output)
+        c->buffer->sync_so_far ();
+      c->buffer->message (c->font,
+			  "recursed to lookup %u at %d",
+			  (unsigned) lookupRecord[i].lookupListIndex,
+			  buffer->idx);
+    }
+
     unsigned int new_len = buffer->backtrack_len () + buffer->lookahead_len ();
     int delta = new_len - orig_len;