maxFontSizeMultiplier works differently between iOS and Android

Description

• maxFontSizeMultiplier affects the fontSize on both Android and iOS.
• When font scaling is set to a value higher than maxFontSizeMultiplier, both Android and iOS clamp the fontSize value
• When it comes to lineHeight, it acts differently. iOS clamps the value while Android ignores the maxFontSizeMultiplier for lineHeight

Please see the screenshots for a side-by-side comparison

Steps to reproduce

1. Install he reproducer app with yarn android and yarn ios
2. Take a screenshot of the app so you can compare later
3. Increase the font scaling. You can either use the settings app, or cmd option + on iOS simulator, and adb shell settings put system font_scale <value> on Android
4. Take another screenshot and compare those two

React Native Version

0.85.2

Affected Platforms

Runtime - iOS, Runtime - Android

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

info Fetching system and libraries information...
System:
  OS: macOS 15.7.4
  CPU: (12) arm64 Apple M4 Pro
  Memory: 258.47 MB / 48.00 GB
  Shell:
    version: 0.109.1
    path: /Users/burakguner/.cargo/bin/nu
Binaries:
  Node:
    version: 24.13.0
    path: /Users/burakguner/.nix-profile/bin/node
  Yarn:
    version: 1.22.22
    path: /Users/burakguner/.nix-profile/bin/yarn
  npm:
    version: 11.6.2
    path: /Users/burakguner/.nix-profile/bin/npm
  Watchman:
    version: 2026.01.19.00
    path: /Users/burakguner/.nix-profile/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/burakguner/.local/share/gem/ruby/3.3.0/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.2
      - iOS 26.2
      - macOS 26.2
      - tvOS 26.2
      - visionOS 26.2
      - watchOS 26.2
  Android SDK:
    API Levels:
      - "30"
      - "31"
      - "34"
      - "35"
      - "36"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-30 | ARM 64 v8a
      - android-34 | Google Play ARM 64 v8a
      - android-35 | Google APIs ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
      - android-36.1 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.3 AI-253.32098.37.2534.15232325
  Xcode:
    version: 26.2/17C52
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 21.0.8
    path: /Users/burakguner/.nix-profile/bin/javac
  Ruby:
    version: 3.4.8
    path: /Users/burakguner/.nix-profile/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.1.0
    wanted: 20.1.0
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.85.2
    wanted: 0.85.2
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

N/A

MANDATORY Reproducer

https://github.com/atlj/reproducer-max-font-size-multiplier-line-height

Screenshots and Videos

Font Scale	iOS	Android
1
2.143

Notice how lineHeight is not clamped on Android screenshots

Bắt đầu với ứng dụng tái hiện bắt buộc và chạy ứng dụng bằng yarn android và yarn ios. So sánh ảnh chụp màn hình ở tỷ lệ phông chữ bình thường và tăng lên bằng các lệnh cài đặt của issue; được xem là hoàn thành khi lineHeight của Android được giới hạn bởi maxFontSizeMultiplier nhất quán với iOS.