The contents still can be seen in opened window after the phone is unplugged from Ubuntu

$ system-image-cli -i
current build number: 6
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en
last update: 2015-05-29 15:11:01
version version: 6
version ubuntu: 20150528.1
version device: 20150522-a851049
version custom: 20150526-719-5-24

Steps to reproduce:
1. Connect the phone via mtp to Ubuntu (here is Trusty,14.04.2)
2. Ensure you can see content on phone in Nautilus
2. Unplug the phone

Expected results:
Nautilus unmounts the phone and no contents can be seen.

Actual results:
Nautilus unmounts the phone, the device icon disappears from computer launcher, but the contents still can be seen in opened window

Additional information:
The opened window and contents will disappear immediately once phone is unplugged from windows system.