unify removeClippedSubviews prop in FlatList

packages/react-native/Libraries/Lists/FlatList.js

@@ -17,6 +17,7 @@ import type {
   ViewToken,
 } from '@react-native/virtualized-lists';
 
+import * as ReactNativeFeatureFlags from '../../src/private/featureflags/ReactNativeFeatureFlags';
 import {type ScrollResponderType} from '../Components/ScrollView/ScrollView';
 import {
   VirtualizedList,
@@ -158,7 +159,11 @@ type OptionalProps<ItemT> = {|
 
 // removeClippedSubviewsOrDefault(this.props.removeClippedSubviews)
 function removeClippedSubviewsOrDefault(removeClippedSubviews: ?boolean) {
-  return removeClippedSubviews ?? Platform.OS === 'android';
+  if (ReactNativeFeatureFlags.shouldUseRemoveClippedSubviewsAsDefaultOnIOS()) {
+    return removeClippedSubviews ?? true;
+  } else {
+    return removeClippedSubviews ?? Platform.OS === 'android';
+  }
 }
 
 // numColumnsOrDefault(this.props.numColumns)

packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.json

@@ -53,6 +53,10 @@
     "shouldUseSetNativePropsInFabric": {
       "description": "Enables use of setNativeProps in JS driven animations.",
       "defaultValue": true
+    },
+    "shouldUseRemoveClippedSubviewsAsDefaultOnIOS": {
+      "description": "removeClippedSubviews prop will be used as the default in FlatList on iOS to match Android",
+      "defaultValue": false
     }
   }
 }

packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<c43dd1db78ac69ca3c39577d45a04071>>
+ * @generated SignedSource<<f804aa82b9eb799f281a1d752974cc4a>>
  * @flow strict-local
  */
 
@@ -33,6 +33,7 @@ export type ReactNativeFeatureFlagsJsOnly = {
   enableAccessToHostTreeInFabric: Getter<boolean>,
   shouldUseAnimatedObjectForTransform: Getter<boolean>,
   shouldUseSetNativePropsInFabric: Getter<boolean>,
+  shouldUseRemoveClippedSubviewsAsDefaultOnIOS: Getter<boolean>,
 };
 
 export type ReactNativeFeatureFlagsJsOnlyOverrides = Partial<ReactNativeFeatureFlagsJsOnly>;
@@ -82,6 +83,11 @@ export const shouldUseAnimatedObjectForTransform: Getter<boolean> = createJavaSc
  */
 export const shouldUseSetNativePropsInFabric: Getter<boolean> = createJavaScriptFlagGetter('shouldUseSetNativePropsInFabric', true);
 
+/**
+ * removeClippedSubviews prop will be used as the default in FlatList on iOS to match Android
+ */
+export const shouldUseRemoveClippedSubviewsAsDefaultOnIOS: Getter<boolean> = createJavaScriptFlagGetter('shouldUseRemoveClippedSubviewsAsDefaultOnIOS', false);
+
 /**
  * Common flag for testing. Do NOT modify.
  */