[0.77.1] minimumFontScale doesn't work in New Arch

[DarkShtir]

Description

Text props minimumFontScale doesn't work

Steps to reproduce

1. Install default app (npx @react-native-community/cli@latest init AwesomeProject)
2. Wrap Text to small View (width:100, height:100)
3. Add large text into text component
4. Set text props ( adjustsFontSizeToFit={true}
   minimumFontScale={0.9}
   numberOfLines={1} )
5. See result, text are small

React Native Version

0.77.1

Affected Platforms

Runtime - Android, Runtime - iOS

Areas

Fabric - The New Renderer

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

System:
  OS: macOS 15.1.1
  CPU: (12) arm64 Apple M3 Pro
  Memory: 238.53 MB / 18.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.11.0
    path: ~/.nvm/versions/node/v22.11.0/bin/node
  Yarn: Not Found
  npm:
    version: 10.9.0
    path: ~/.nvm/versions/node/v22.11.0/bin/npm
  Watchman:
    version: 2024.12.02.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/opt/ruby/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.1
      - iOS 18.1
      - macOS 15.1
      - tvOS 18.1
      - visionOS 2.1
      - watchOS 11.1
  Android SDK:
    API Levels:
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 34.0.0
      - 35.0.0
    System Images:
      - android-27 | ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.3 AI-243.22562.218.2431.13114758
  Xcode:
    version: 16.1/16B40
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.13
    path: /usr/bin/javac
  Ruby:
    version: 3.3.6
    path: /opt/homebrew/opt/ruby/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.1.3
    wanted: 15.1.3
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.77.1
    wanted: ^0.77.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

-

Reproducer

https://snack.expo.dev/t1eb6mkjQgY6fAFeXjhPK

Screenshots and Videos

import { Text, SafeAreaView, StyleSheet, View } from 'react-native';

export default function App() {
  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.wrapper}>
        <Text style={styles.paragraph} 
        adjustsFontSizeToFit={true}
        minimumFontScale={0.9}
        numberOfLines={1} >
          Change code in the editor and watch it change on your phone! Save to get a shareable url.
        </Text>
      </View>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  wrapper:{
    width:100,
    height:100,
    backgroundColor:'yellow'
  },
  container: {
    flex: 1,
    justifyContent: 'center',
    backgroundColor: '#ecf0f1',
    padding: 8,
    alignItems:'center'
  },
  paragraph: {
    margin: 24,
    fontSize: 18,
    fontWeight: 'bold',
    textAlign: 'center',
  },
});

Patch for fix (based on #43543)
react-native+0.77.1.patch

[cipolleschi]

@DarkShtir Thanks for the issue, the reproducer and the patch. Have you perhaps tested it also with 0.78 and 0.79?

[DarkShtir]

@cipolleschi Not yet. But I'll try to test this on 0.78 and 0.79 this weekend.

[DarkShtir]

0.78 - works only IOS

Android doesn't work

Patch file

react-native+0.78.1.patch

[DarkShtir]

And thanks janicduplessis for PR.

[DarkShtir]

RN-0.79.0-rc.3 the same as 0.78. IOS - works, Android - none.
Need improve Android implementation
Patch file

react-native+0.79.0-rc.3.patch

[DarkShtir]

Any updates?

[DarkShtir]

react-native+0.79.2.patch

This patch fixed problems on stable RN 0.79.2
@janicduplessis @cipolleschi FYI

[tienhdn]

android rn0.79.2 not working

[Swahvay]

Any update on this? It's been a couple months with no word and I've had to disable every instance of this in my app because of this bug.

[javbk201]

I'm having this issue on RN 0.80.1 not working on iOS and Android

[McFly78]

I'm having this issue on RN 0.80.1 not working on iOS and Android

Same for me on IOS with 0.80.2 (New Architecture).
Not tested on Android.

[ZhangShuaiGou]

Hey, just a bit confused: minimumFontScale is claimed as iOS props only. How does it work on Android? Is it a typo in the RN document, or did I misunderstand something?