From a66169f48dc2821f63756661d3a0b0151671b9da Mon Sep 17 00:00:00 2001
From: Max Wang <max.wang.cs@gmail.com>
Date: Mon, 13 Sep 2021 19:03:22 -0700
Subject: [PATCH] avoid padding a struct to be hashed

---
 Source/Details/ASCollectionLayoutContext.mm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Source/Details/ASCollectionLayoutContext.mm b/Source/Details/ASCollectionLayoutContext.mm
index 6f2ba7186..2d0b153f9 100644
--- a/Source/Details/ASCollectionLayoutContext.mm
+++ b/Source/Details/ASCollectionLayoutContext.mm
@@ -85,7 +85,9 @@ - (NSUInteger)hash
 {
   struct {
     CGSize viewportSize;
-    ASScrollDirection scrollableDirections;
+    // Fields must be aligned without padding, otherwise hash result will be different for the same
+    // struct. That's why we use NSUInteger instead of ASScrollDirection.
+    NSUInteger scrollableDirections;
     NSUInteger elementsHash;
     NSUInteger layoutDelegateClassHash;
     NSUInteger additionalInfoHash;