onAttach not reattaching listener when screen orientation changes

[Mek7]

Hi,
I just made a github account to report this issue. It can be easily reproduced.

1. Make sure screen rotation is enabled
2. Open directory chooser
3. Rotate screen
4. Tap the bottom buttons - they stopped working
   From my investigation, when screen is rotated. onDetach is called and then onAttach again. But Option.some() call returns None for some reason. So the listeners attached to the buttons stop working.
   I am a noob in android programming so I cannot fix it myself. Otherwise I would be kind enough to submit a pull request.
   FYI, I am using it in fragment mode.