From c53a25c6579a4d3fe8e6a6fc198d70add41035ec Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 16 Oct 2018 13:57:35 -0700
Subject: [PATCH] [morx] Comment

---
 src/hb-aat-layout-morx-table.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index c88e7a720..925c7da86 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -410,7 +410,7 @@ struct LigatureSubtable
 
 	  uint32_t uoffset = action & LigActionOffset;
 	  if (uoffset & 0x20000000)
-	    uoffset += 0xC0000000;
+	    uoffset |= 0xC0000000; /* Sign-extend. */
 	  int32_t offset = (int32_t) uoffset;
 	  if (buffer->idx >= buffer->len)
 	    return false; // TODO Work on previous instead?