The indicated progress bar doesn't disappear after completely playing a music

[TarotChen]

Test Environment:
$ system-image-cli -i
current build number: 232
device name: krillin
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2016-01-18 03:11:49
version version: 232
version ubuntu: 20160116
version device: 20160108-efc96d8
version custom: 20160111-9

Steps:
1.Go to Music scope
2.On My Music section select a track and tap on its thumbnail to play it
=>Selected item starts playing inline and the progression of the track is indicated with
    - a progress bar
    - total-length
    - time-played label (that updates accordingly)
3.Wait until it's finished
4.Check the UI

Actual result:
The progress bar still displayed
as is the pause control

Expected result:
The indicated progress bar disappears if playing completed.