From 1b9a26f0f6492640f1900628ee1a1d54fdd0d24a Mon Sep 17 00:00:00 2001
From: Michael Schneider <maicki@users.noreply.github.com>
Date: Thu, 20 Sep 2018 09:22:18 -0700
Subject: [PATCH] Add ASExperimentalSkipClearData #trivial (#1136)

* Add ASExperimentalSkipClearData

* Move the experiment check within the if clause
---
 Source/ASCollectionView.mm      | 3 ++-
 Source/ASExperimentalFeatures.h | 1 +
 Source/ASExperimentalFeatures.m | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Source/ASCollectionView.mm b/Source/ASCollectionView.mm
index 69cd53147..94406b0ee 100644
--- a/Source/ASCollectionView.mm
+++ b/Source/ASCollectionView.mm
@@ -576,7 +576,8 @@ - (void)setAsyncDelegate:(id<ASCollectionDelegate>)asyncDelegate
 - (void)_asyncDelegateOrDataSourceDidChange
 {
   ASDisplayNodeAssertMainThread();
-  if (_asyncDataSource == nil && _asyncDelegate == nil) {
+  
+  if (_asyncDataSource == nil && _asyncDelegate == nil && !ASActivateExperimentalFeature(ASExperimentalSkipClearData)) {
     [_dataController clearData];
   }
 }
diff --git a/Source/ASExperimentalFeatures.h b/Source/ASExperimentalFeatures.h
index 26c228f8e..e4bdf067f 100644
--- a/Source/ASExperimentalFeatures.h
+++ b/Source/ASExperimentalFeatures.h
@@ -24,6 +24,7 @@ typedef NS_OPTIONS(NSUInteger, ASExperimentalFeatures) {
   ASExperimentalDeallocQueue = 1 << 6,                      // exp_dealloc_queue_v2
   ASExperimentalCollectionTeardown = 1 << 7,                // exp_collection_teardown
   ASExperimentalFramesetterCache = 1 << 8,                  // exp_framesetter_cache
+  ASExperimentalSkipClearData = 1 << 9,                     // exp_skip_clear_data
   ASExperimentalFeatureAll = 0xFFFFFFFF
 };
 
diff --git a/Source/ASExperimentalFeatures.m b/Source/ASExperimentalFeatures.m
index b12891fd7..4be736033 100644
--- a/Source/ASExperimentalFeatures.m
+++ b/Source/ASExperimentalFeatures.m
@@ -20,7 +20,8 @@
                                       @"exp_network_image_queue",
                                       @"exp_dealloc_queue_v2",
                                       @"exp_collection_teardown",
-                                      @"exp_framesetter_cache"]));
+                                      @"exp_framesetter_cache"
+                                      @"exp_skip_clear_data"]));
   
   if (flags == ASExperimentalFeatureAll) {
     return allNames;