FlatList re-mount all the row when using columns

[NiccoloCase]

Description

Regardless of the use of optimization techniques, such as React.memo or useCallback, when a FlatList with columns (numColumns > 1) is created and an element is added or removed from the list, this causes all components of the row where the element was added or removed to be re-mounted. This is easily noticeable if entry animations are used (but it has other serious repercussions). I'm currently stuck in development on this issue (and switching to unsare scroll view would make the app unusable). There are many similar issues by now, all closed without any discussion or solution, and since it has been years now I think it is time to take the problem into consideration.

Steps to reproduce

1. configure a Flatlist with numColumns > 1 2) add dynamically a new item or remove an item 3) all the items of the row addicted are re-mounted

React Native Version

0.74.3

Affected Platforms

Runtime - Android, Runtime - iOS

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (8) arm64 Apple M2
  Memory: 127.25 MB / 8.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.4.1
    path: /opt/homebrew/bin/node
  Yarn:
    version: 1.22.19
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.8.2
    path: /opt/homebrew/bin/npm
  Watchman:
    version: 2024.07.01.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /Users/niccolocaselli/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.5
      - iOS 17.5
      - macOS 14.5
      - tvOS 17.5
      - visionOS 1.2
      - watchOS 10.5
  Android SDK:
    Android NDK: 22.1.7171670
IDEs:
  Android Studio: 2023.2 AI-232.10300.40.2321.11567975
  Xcode:
    version: 15.4/15F31d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/niccolocaselli/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.74.3
    wanted: 0.74.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false

Stacktrace or Logs

no crash

Reproducer

https://snack.expo.dev/@niccolocase/0aa680

Screenshots and Videos

Registrazione.schermo.2024-08-05.alle.14.45.06.mov

[react-native-bot]

⚠️

Newer Version of React Native is Available!

ℹ️

You are on a supported minor version, but it looks like there's a newer patch available - 0.74.4. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[react-native-bot]

⚠️

Newer Version of React Native is Available!

ℹ️

You are on a supported minor version, but it looks like there's a newer patch available - undefined. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[NiccoloCase]

the issue is still persistent. I'have tested it in other environments

[s77rt]

Being handled in #43205