OSK doesn't hide automatically when the recording prompt shows

[quandan]

current build number: 299
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en
last update: 2016-04-05 03:40:29
version version: 299
version ubuntu: 20160405
version device: 20160331-e143fc2
version custom: 20160324-945-18-69

Steps:
1.Make sure you haven't sent audio message in message before
2.Open message app and swipe up to compose a new one and make sure the OSK shows
3.Tap on the recording icon

Expectation:
After step 3, the trust prompt will show , at the same time OSK will hide automatically

Actual result:
the trust prompt shows , but OSK doesn't hide automatically