From 54e9ab4a91a762dc8a730e22a5b103b206b05db7 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 18 Jul 2022 18:57:14 -0600
Subject: [PATCH] [GPOS/Cursive] Fix breaking of parent-child attachment

Mostly fixes https://github.com/harfbuzz/harfbuzz/issues/2469
---
 src/OT/Layout/GPOS/CursivePosFormat1.hh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/OT/Layout/GPOS/CursivePosFormat1.hh b/src/OT/Layout/GPOS/CursivePosFormat1.hh
index e212fab97..ca8e509e4 100644
--- a/src/OT/Layout/GPOS/CursivePosFormat1.hh
+++ b/src/OT/Layout/GPOS/CursivePosFormat1.hh
@@ -223,7 +223,13 @@ struct CursivePosFormat1
      * https://github.com/harfbuzz/harfbuzz/issues/2469
      */
     if (unlikely (pos[parent].attach_chain() == -pos[child].attach_chain()))
+    {
       pos[parent].attach_chain() = 0;
+      if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
+	pos[parent].y_offset = 0;
+      else
+	pos[parent].x_offset = 0;
+    }
 
     buffer->idx++;
     return_trace (true);