Telegram still pops up the sticker as the chat is discarded

[Jin]

Description:
Telegram pops up the sticker still when the chat is discarded.

Reproduce Steps:
    a) Launch Telegram
    b) Init. a secret chat with the contact
    c) Make the text "Secret chat discarded" shown via leaving the chat from contact side
    d) Press the sticker position (around the last char. 'd' of above text)
    e) Observe the Telegram UI

Expected Result:
No any interactions/operations needed in the discarded chat.

Actual Result:
Telegram can popup the sticker selection in the discarded chat.

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