**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
eventTypes.select,
      activeElementInst,
      nativeEvent,
      nativeEventTarget,
    );
    syntheticEvent.type = 'select';
    syntheticEvent.target = activeElement;
    accumulateTwoPhaseDispatches(syntheticEvent);
    return syntheticEvent;
  }
  return null;
}
/**
 * This plugin creates an `onSelect` event that normalizes select events
 * across form elements.
 *
 * Supported elements are:
 * - input (see `isTextInputElement`)
 * - textarea
 * - contentEditable
 *
 * This differs from native browser implementations in the following ways:
 * - Fires on contentEditable fields as well as inputs.
 * - Fires for collapsed selection.
 * - Fires after user input.
 */
const SelectEventPlugin = {
  eventTypes: eventTypes,
  extractEvents: function(
    topLevelType,