ScrollView horizontal scrolling breaks (unable to scroll to end) when using minWidth instead of width: Math.max(minWidth, ...)

Description

When using minWidth on a horizontally scrolling ScrollView, the scrollable content does not allow scrolling all the way to the end. Replacing minWidth: 500 with a computed width: Math.max(width * 0.9, 500) resolves the issue, making the full content scrollable.

Steps to reproduce

1. open the snack reproducer
2. run on a device with viewport width < 500 (e.g. Pixel 8)
3. try to scroll to the end to observe the last item being cut off

React Native Version

0.78.0

Affected Platforms

Runtime - iOS, Runtime - Android

Output of npx @react-native-community/cli info

System:
  OS: macOS 15.4.1
  CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  Memory: 222.21 MB / 64.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 23.3.0
    path: /usr/local/bin/node
  Yarn: Not Found
  npm:
    version: 10.9.0
    path: /usr/local/bin/npm
  Watchman:
    version: 2025.03.10.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.4
      - iOS 18.4
      - macOS 15.4
      - tvOS 18.4
      - visionOS 2.4
      - watchOS 11.4
  Android SDK:
    API Levels:
      - "34"
      - "35"
    Build Tools:
      - 32.0.0
      - 33.0.0
      - 34.0.0
      - 35.0.0
    System Images:
      - android-30 | Google Play Intel x86 Atom
      - android-31 | Google APIs Intel x86_64 Atom
      - android-33 | Google Play Intel x86_64 Atom
      - android-34 | Intel x86_64 Atom
      - android-34 | Google APIs Intel x86_64 Atom
      - android-34 | Google Play Intel x86_64 Atom
      - android-35 | ARM 64 v8a
      - android-35 | Intel x86_64 Atom
      - android-35 | Google APIs Intel x86_64 Atom
      - android-35 | Google Play Intel x86_64 Atom
      - android-36 | Pre-Release 16 KB Page Size Google Play Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.3 AI-243.22562.218.2431.13114758
  Xcode:
    version: 16.3/16E140
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.13
    path: /usr/bin/javac
  Ruby:
    version: 3.3.5
    path: /usr/local/opt/ruby/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.1
    wanted: 15.0.1
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.78.0
    wanted: 0.78.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No crash/failure

MANDATORY Reproducer

https://snack.expo.dev/@alex_p8/calm-indigo-apples

Screenshots and Videos

Expected behavior (when scrolling to the end):

Actual behavior (when scrolling to the end):

Beginne mit dem obligatorischen Snack-Reproducer und dem für Android und iOS beschriebenen ScrollView-Verhalten. Vergleiche horizontales Scrolling mit minWidth: 500 mit dem Workaround über die berechnete Breite, und betrachte das Issue als erledigt, wenn das letzte Element auf Geräten mit einem Viewport, der schmaler als 500 ist, vollständig erreichbar ist.