React keys warning when using dangerouslyDisableWhitespaceCollapsing

[eVoloshchak]

Decision Table

• My issue does not look like “The HTML attribute 'xxx' is ignored” (unless we claim support for it)
• My issue does not look like “The HTML element <yyy> is not rendered”

Good Faith Declaration

• I have read the HELP document here: https://git.io/JBi6R
• I have read the CONTRIBUTING document here: https://git.io/JJ0Pg
• I have confirmed that this bug has not been reported yet

Description

I'm trying to render multiple divs with a line break between them
(<div>str1</div><br /><div>str2</div><br /><div>str3</div>).
Problem arises when setting dangerouslyDisableWhitespaceCollapsing prop to true, I get the following yellow box warning:

Warning: Encountered two children with the same key, 0. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.

Root cause:
Library calls mapCollapsibleChildren for each child and assigns a key to it on this line:

const key = childTnode.nodeIndex;

But the problem is, TPhrasing render nodes always have a nodeIndex = 0

Suggested fix:
Use element's index additionally to nodeIndex when assigning keys to children

const key = `${childTnode.nodeIndex}_${n}`

This ensures that every child always has a unique key

Is this fix acceptable? Should I submit a PR?

React Native Information

System:
    OS: Linux 5.4 Linux Mint 20.3 (Una)
    CPU: (4) x64 Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
    Memory: 1.17 GB / 7.69 GB
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 14.9.0 - /usr/local/bin/node
    Yarn: Not Found
    npm: 6.14.8 - /usr/local/bin/npm
    Watchman: 2022.03.21.00 - /home/linuxbrew/.linuxbrew/bin/watchman
  SDKs:
    Android SDK: Not Found
  IDEs:
    Android Studio: Not Found
  Languages:
    Java: Not Found
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.2 => 17.0.2 
    react-native: 0.68.1 => 0.68.1 
  npmGlobalPackages:
    *react-native*: Not Found

RNRH Version

6.3.4

Tested Platforms

• Android
• iOS
• Web
• MacOS
• Windows

Reproduction Platforms

• Android
• iOS
• Web
• MacOS
• Windows

Minimal, Reproducible Example

Yellow box warnings seem to be disabled on snack, so I've created this git repo.

import React from 'react';
import {
  TRenderEngineProvider,
  RenderHTMLConfigProvider,
  RenderHTMLSource
} from 'react-native-render-html';



const BaseHTMLEngineProvider = (props) => {
  return (
      <TRenderEngineProvider dangerouslyDisableWhitespaceCollapsing>
          <RenderHTMLConfigProvider >
              {props.children}
          </RenderHTMLConfigProvider>
      </TRenderEngineProvider>
  );
};


const App = () => {
  const source = {
    html: `<div>str1</div><br /><div>str2</div><br /><div>str3</div>`
  };

  return (
    <BaseHTMLEngineProvider>
      <RenderHTMLSource source={source} contentWidth={500} />
    </BaseHTMLEngineProvider>
  )
};

export default App;

Additional Notes

No response