From 9144840d37e0d0a7f1b53c4dea5a1522a859854b Mon Sep 17 00:00:00 2001
From: "Jorj X. McKie" <jorj.x.mckie@outlook.de>
Date: Mon, 28 Aug 2023 05:26:47 -0400
Subject: [PATCH] Fixing #2522

Fix typo when changing the RBGroups entry of Optional Contents.
---
 fitz/fitz.i | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fitz/fitz.i b/fitz/fitz.i
index 1341b7b29..38c4aa83d 100644
--- a/fitz/fitz.i
+++ b/fitz/fitz.i
@@ -4030,7 +4030,7 @@ if rbgroups:
         if not type(x) in (list, tuple):
             raise ValueError("bad RBGroup '%s'" % x)
         s = set(x).difference(ocgs)
-        if f != set():
+        if s != set():
             raise ValueError("bad OCGs in RBGroup: %s" % s)
 
 if basestate: