From b5be2317201774c84470167767ad83c8637cad5b Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 5 Jun 2014 19:00:22 -0400
Subject: [PATCH] [gsub] Adjust single-length ligature subst to act like single
 subst

---
 src/hb-ot-layout-gsub-table.hh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/hb-ot-layout-gsub-table.hh b/src/hb-ot-layout-gsub-table.hh
index 60e292eea..d73ddc1d9 100644
--- a/src/hb-ot-layout-gsub-table.hh
+++ b/src/hb-ot-layout-gsub-table.hh
@@ -638,6 +638,14 @@ struct Ligature
 
     if (unlikely (!count)) return TRACE_RETURN (false);
 
+    /* Special-case to make it in-place and not consider this
+     * as a "ligated" substitution. */
+    if (unlikely (count == 1))
+    {
+      c->replace_glyph (ligGlyph);
+      return TRACE_RETURN (true);
+    }
+
     bool is_mark_ligature = false;
     unsigned int total_component_count = 0;