Android ignores unicode soft hyphen (u00AD)

Description: On android soft-hyphen unicode u00AD is ignored, neither the word break nor the hyphen are displayed correctly. Using u200B is a workaround for getting better word wrapping results but is still missing the hyphen.

React Native version:

System:
    OS: macOS 10.15.3
    CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
    Memory: 108.98 MB / 16.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 13.10.1 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.13.7 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.2, watchOS 6.1
    Android SDK:
      API Levels: 28, 29
      Build Tools: 28.0.3, 29.0.0, 29.0.1
      System Images: android-28 | Google Play Intel x86 Atom, android-29 | Intel x86 Atom_64
  IDEs:
    Android Studio: 3.6 AI-192.7142.36.36.6241897
    Xcode: 11.3.1/11C504 - /usr/bin/xcodebuild
  npmPackages:
    react: 16.12.0 => 16.12.0 
    react-native: 0.61.5 => 0.61.5 
  npmGlobalPackages:
    react-native-cli: 2.0.1

Steps To Reproduce

Render the following on android vs. iOS

const testString = 'sup\u00ADer\u00ADfrag\u00ADilis\u00ADtice\u00ADxpial\u00ADidocious'

return (
  <View>
    <Text style={{ width: 100 }}>
      {testString}
    </Text>
  </View>
);

Expected Results

Screenshot from iOS

Actual Result

Screenshot from Android

[lennartdemeij]

I’m checking for that as well.

if (line.text.substr(line.text.length - 2) === "- ") {
 alreadyHyphenated = true;
}

and I don’t change the text again if alreadyHyphenated === true

I know it’s not perfect (yet), but it is a step in the right direction I think. Not it’s just eliminating these quirks. It also sometimes brings the hyphenated word to the next line because the added dash pushes it over the edge. I’ll have to think of a solution for that as well…

[fabriziobertoglio1987]

https://developer.android.com/reference/android/widget/TextView#setHyphenationFrequency(int)

setHyphenationFrequency Sets the frequency of automatic hyphenation to use when determining word breaks.

seems that setHyphenationFrequency allows us to use automatic hyphenation