[iOS] editor loses focus when text composition ends

The editor loses focus when I'm typing in Chinese on my iOS device.

Here is the demo

condition 1: typing the first word in a new block

1. start typing
2. composition starts
3. select the word (or press the confirm button on the bottom right of the keyboard )
4. composition ends
5. text editor loses focus

condition 2

1. start typing
2. composition starts
3. delete everything
4. composition ends
5. text editor loses focus

versions ios9 draft-js v0.8.1