From fc60a5aab087aeb3c84f836022ad739cd9e256ef Mon Sep 17 00:00:00 2001
From: Sascha Hlusiak <mail@saschahlusiak.de>
Date: Tue, 5 Jan 2021 15:10:32 +0800
Subject: [PATCH] Fix extra child traversal in collectDirtyChildren to cause
 app to hang when saving object with many pointers

---
 Parse/Parse/PFObject.m | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Parse/Parse/PFObject.m b/Parse/Parse/PFObject.m
index 657207dd4..2268b57d4 100644
--- a/Parse/Parse/PFObject.m
+++ b/Parse/Parse/PFObject.m
@@ -207,7 +207,7 @@ + (BFTask *)_enqueue:(BFTask *(^)(BFTask *toAwait))taskStart forObjects:(NSArray
 + (BOOL)collectDirtyChildren:(id)node
                     children:(NSMutableSet *)dirtyChildren
                        files:(NSMutableSet *)dirtyFiles
-                        seen:(NSSet *)seen
+                        seen:(NSMutableSet *)seen
                      seenNew:(NSSet *)seenNew
                  currentUser:(PFUser *)currentUser
                        error:(NSError * __autoreleasing *)error {
@@ -288,7 +288,7 @@ + (BOOL)collectDirtyChildren:(id)node
             if ([seen containsObject:object]) {
                 return YES;
             }
-            seen = [seen setByAddingObject:object];
+            [seen addObject:object];
 
             // Recurse into this object's children looking for dirty children.
             // We only need to look at the child object's current estimated data,
@@ -330,7 +330,7 @@ + (BOOL)collectDirtyChildren:(id)child
     return [self collectDirtyChildren:child
                              children:dirtyChildren
                                 files:dirtyFiles
-                                 seen:[NSSet set]
+                                 seen:[NSMutableSet set]
                               seenNew:[NSSet set]
                           currentUser:currentUser
                                 error:error];