Adds _lineHeight = NAN; to RCTTextAttributes

[aparedes]

Motivation

On iOS, when the parent Text contains the lineHeight style prop, and the children are also Text components they don't inherit the lineHeight prop.

Test Plan

This is for iOS only.
Create a react-native project with React Native 0.54.0 or 0.54.1 and change the app to:

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

type Props = {};
export default class App extends Component<Props> {
  render() {
    return (
      <View style={styles.container}>
        <Text style={{ fontWeight: 'bold', lineHeight: 40 }}>
          <Text style={{ color: 'orange' }}>I am bold and orange, </Text>
          <Text style={{ color: 'red' }}>I am bold and red, </Text>
          <Text style={{ color: 'blue' }}>I am bold and blue, </Text>
          <Text style={{ color: 'purple' }}>I am bold and purple, </Text>
          <Text style={{ color: 'yellow' }}>I am bold and yellow, </Text>
          <Text style={{ color: 'pink' }}>I am bold and pink</Text>
        </Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    backgroundColor: 'black',
    flex: 1,
    justifyContent: 'center',
    padding: 50,
  },
});

It displays:

But should look like:

Related PRs

New <Text> iOS 2716f53

Release Notes

[IOS] [MINOR] [Text] - Inherit lineheight

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