[BUG] FormBuilder onChange props, using schema for setState is throwing error.

Environment

• Formio.js version: 4.0.0-rc.12
• React-formio version: 4.0.0-rc.7
• Frontend framework: React
• Browser: Chrome
• Browser version: Chrome 75

Steps to Reproduce

1. Embed FormBuilder in react app (create-react-app)
2. Provide onChange prop, use the schema to change state

import React, { useState } from 'react';
import { FormBuilder } from 'react-formio';

const App = () => {
  const [schemaState, setSchemaState] = useState();
  return (
    <div>
      <FormBuilder
        form={{ display: 'form' }}
        onChange={(schema) => setSchemaState(JSON.stringify(schema))}
      />
    </div>
  );
}

export default App;

Expected behavior

Should update state without error.

Observed behavior

Not updating state. Throws an error: ‘dragula.js:710 Uncaught TypeError: Failed to execute ‘elementFromPoint’ on ‘Document’: The provided double value is non-finite.’

[lukeburns]

I think this is an issue because dragula manipulates the dom directly, which conflicts with react’s dom management. Isolating FormBuilder from its parent like in the following resolves the issue, but this may not work for everyone, if there’s a situation in which FormBuilder does need to update with state.

import React, { useState } from 'react';
import { FormBuilder } from 'react-formio';

const App = () => {
  const [schemaState, setSchemaState] = useState();
  return (
    <Isolate>
      <FormBuilder
        form={{ display: 'form' }}
        onChange={(schema) => setSchemaState(JSON.stringify(schema))}
      />
    </Isolate>
  );
}

export default App;

class Isolate extends React.Component {
  shouldComponentUpdate () {
    return false // prevent parent state changes from re-rendering FormBuilder
  }
  render () {
    return <React.Fragment>
      {this.props.children}
    </React.Fragment>
  }
}

[aminmc]

@jhen1422 This is still an open issue for us due the fact that we need to pass state into the form builder. Otherwise when a user switches between form and wizard we lose the components that was added. This was a feature of the old form builder