Secret chat header goes to a blank after image sent

[Jin]

Description:
Telegram secret chat title/avatar goes to a blank around 2 seconds after image sent,
sometimes it does not recover.

Reproduce Steps:
    a) Launch Telegram
    b) Init. a secret chat
    c) Select to send attachment by choosing "Photos"
    d) Choose the image from Gallery/Camera app to send
    e) Observe the selected secret chat avatar/title

Expected Result:
The header does not need to update, keep it as original.

Actual Result:
It refresh to a blank without name for around 2 seconds,
sometimes it does not recover, just keep the blank forever.

Occurrence:
10/10 (100%)

Software Information:
    com.ubuntu.telegram (2.2.26.0)

Hardware Information:
    current build number: 480
    device name: mako
    channel: ubuntu-touch/rc-proposed/ubuntu
    last update: 2016-07-07 11:36:27
    version version: 480
    version ubuntu: 20160706.1
    version device: 20160401.1
    version custom: 20160706.1