react-codemirror: onChange fires when value is set programmatically - http://bl.ocks.org/insin/raw/9e507894f3858028c7e5/

index.html

<meta charset="UTF-8">
<script src="https://fb.me/react-0.13.3.js"></script>
<script src="https://fb.me/JSXTransformer-0.13.3.js"></script>
<script src="https://rawgit.com/JedWatson/react-codemirror/master/dist/react-codemirror.js"></script>
<link rel="stylesheet" href="https://rawgit.com/codemirror/CodeMirror/master/lib/codemirror.css">
<div id="app"></div>
<script type="text/jsx;harmony=true">void function() { "use strict";

var valueSeed = 1

var App = React.createClass({
  getInitialState() {
    return {
      value: 'Value ' + valueSeed
    }
  },
  changeValue() {
    this.setState({value: 'Value ' + ++valueSeed})
  },
  onChange(code) {
    alert('onChange: ' + code)
    this.setState({value: code})
  },
  render() {
    return <div>
      <Codemirror value={this.state.value} onChange={this.onChange} options={{lineNumbers: true}}/>
      <button type="button" onClick={this.changeValue}>Change value</button>
    </div>
  }
})

React.render(<App/>, document.getElementById('app'))

}()</script>