testing implementation of mantainVisibleContentPosition

PR 29466 facebook#29466
Video test https://www.icloud.com/iclouddrive/051-C9g_yFF2UDecA44dCEUIA#testing_mantain_content_position_api
facebook#34141
https://www.icloud.com/iclouddrive/051-C9g_yFF2UDecA44dCEUIA#testing_mantain_content_position_api

Author: fabOnReact

ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java

@@ -1112,6 +1112,8 @@ public void onLayoutChange(
 
     int currentScrollY = getScrollY();
     int maxScrollY = getMaxScrollY();
+    // this is a test of the implementation from
+    // https://github.com/facebook/react-native/pull/29466/files#diff-dd50314ea4292aa2fb65c5511378b1d7bce34d337cd8f9b99890761ee2dd8160R1040-R1073
     if (mEnabledTalkbackCompatibleInvertedList) {
       if (mInitialScrollTriggered) {
         scrollMaintainVisibleContentPosition();

packages/rn-tester/js/examples/FlatList/FlatList-inverted.js

@@ -143,10 +143,10 @@ function NestedFlatList(props) {
       <Text>Flatlist</Text>
       <FlatList
         maintainVisibleContentPosition={{
-          minIndexForVisible: minIndex,
+          minIndexForVisible: 0,
         }}
-        inverted
-        enabledTalkbackCompatibleInvertedList
+        // inverted
+        // enabledTalkbackCompatibleInvertedList
         renderItem={renderItem}
         data={items}
         /*