From 7587683cdce8ee9b7f07bae82aa1bb163e79ab92 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 7 Mar 2018 09:55:22 +0100
Subject: [PATCH] [set] Minor

In preparation to fix https://github.com/harfbuzz/harfbuzz/issues/863

Binary operations are sets are completely broken. Ouch.
---
 src/hb-set-private.hh | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/hb-set-private.hh b/src/hb-set-private.hh
index 49cd7912..09ca010d 100644
--- a/src/hb-set-private.hh
+++ b/src/hb-set-private.hh
@@ -430,19 +430,26 @@ struct hb_set_t
       {
 	a--;
 	b--;
-        Op::process (page_at (--count).v, page_at (a).v, other->page_at (b).v);
+	count--;
+	Op::process (page_at (count).v, page_at (a).v, other->page_at (b).v);
       }
       else if (page_map[a - 1].major > other->page_map[b - 1].major)
       {
-        a--;
-        if (Op::passthru_left)
-	  page_at (--count).v = page_at (a).v;
+	a--;
+	if (Op::passthru_left)
+	{
+	  count--;
+	  page_at (count).v = page_at (a).v;
+	}
       }
       else
       {
-        b--;
-        if (Op::passthru_right)
-	  page_at (--count).v = other->page_at (b).v;
+	b--;
+	if (Op::passthru_right)
+	{
+	  count--;
+	  page_at (count).v = other->page_at (b).v;
+	}
       }
     }
     if (Op::passthru_left)
-- 
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