**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
After an `onDrop` event has fired inside an "editable" element (input, textarea, contentEditable), the `onSelect` event on that element will no longer fire when changing selection using the keyboard. 

As you can see in this gif below, the onSelect event gets called each time I move the cursor around (using the arrow keys). But once the `onDrop` event has fired, `onSelect` will no longer fire when I move the cursor around (also using the keys):

![react-onselect-bug](https://user-images.githubusercontent.com/3599069/32080216-bd42f580-baae-11e7-98ee-93a482ed80ca.gif)

[Here's the jsfiddle](https://jsfiddle.net/owmL8n6u/1/) I used to record the video above.

**What is the expected behavior?**
The `onSelect` event should always fire when selection changes.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
React 16 / Chrome 62
*
 * @emails react-core
 */
'use strict';
let React;
let ReactDOM;
describe('SelectEventPlugin', () => {
  let container;
  beforeEach(() => {
    React = require('react');
    ReactDOM = require('react-dom');
    container = document.createElement('div');
    document.body.appendChild(container);
  });
  afterEach(() => {
    document.body.removeChild(container);
    container = null;
  });
  
  it('does not get confused when dependent events are registered independently', () => {
    const select = jest.fn();
    const onSelect = event => {
      expect(typeof event).toBe('object');
      expect(event.type).toBe('select');
      expect(event.target).toBe(node);
      select(event.currentTarget);
    };
    
    const node = ReactDOM.render(
      <input type="text" onMouseDown={function() {}} />,