From f205a6cc28e139c16966a7a43a5f59bdd0234002 Mon Sep 17 00:00:00 2001
From: Adlai Holler <guy.on.internet@icloud.com>
Date: Fri, 25 Mar 2016 22:33:28 -0700
Subject: [PATCH] Copy sublayers in recursivelyTriggerDisplayForLayer to avoid
 NSFastEnumerationMutation exception

---
 AsyncDisplayKit/ASDisplayNode.mm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/AsyncDisplayKit/ASDisplayNode.mm b/AsyncDisplayKit/ASDisplayNode.mm
index 17797a62af..eedb99fcd2 100644
--- a/AsyncDisplayKit/ASDisplayNode.mm
+++ b/AsyncDisplayKit/ASDisplayNode.mm
@@ -1797,7 +1797,8 @@ void recursivelyTriggerDisplayForLayer(CALayer *layer, BOOL shouldBlock)
   }
   
   // Kick off the recursion first, so that all necessary display calls are sent and the displayQueue is full of parallelizable work.
-  for (CALayer *sublayer in layer.sublayers) {
+  // NOTE: The docs report that `sublayers` returns a copy but it actually doesn't.
+  for (CALayer *sublayer in [layer.sublayers copy]) {
     recursivelyTriggerDisplayForLayer(sublayer, shouldBlock);
   }