Alarm volume slider should lose the hint and play the alarm sound while changing volume
Duplicate of LP issue at : https://bugs.launchpad.net/ubuntu-clock-app/+bug/1362078
The alarm volume slider in settings displays a hint when changing volume and says just a number between 0 and 100.
This number isn't really relevant to the user, what is, instead, is the actual alarm volume at the selected slider position.
--- Solution ---
- The alarm sound should be played while you're touching the slider (i.e. the slider is focused).
- When the slider loses focus or the user leaves the screen, the alarm volume fades out
Additional comment: To have common User Experience across all application, it will be great to implement volume preview also for "System Settings -> Sound -> Ringer": https://bugs.launchpad.net/ubuntu-ux/+bug/1479374