popup volume previewer should not show up when adjusting volume using a volume slider

[Wenfang Si]

$ system-image-cli -i
current build number: 21
device name: arale
channel: ubuntu-touch/tangxi-vivid-proposed
last update: 2015-04-24 06:07:50
version version: 21

Steps
1. swipe down from Sound Indicator
2. slide on the volume slider
=> a popup volume previewer shows up
3. enter "System Settings -> Sound"
4. slide on the "Ringer" volume slider
=> a popup volume previewer shows up

Expect
In step2 and step4,
The popup previewer is unexpected, as there is already a slider shows the current volume status.

[Sebastien Bacher (seb128)]

that's an indicator issue

[Sebastien Bacher (seb128)]

Talked to Ted about it, we should add a new action to indicator-sound to change the sound without notifications and makes the settings use that

[Charles Kerr (charlesk)]

ted, do we really need a new action for this? uss is currently using isound's "volume" method, so I think we already have all the inputs we need for this.

[Matthew Paul Thomas (mpt)]

This is a duplicate of bug 1389761, but that has been marked as a duplicate of bug 1398888, which doesn't mention volume notifications at all. So even if that's correct, it's unlikely any developers will understand its importance.

It is also related to bug 652978, which currently focuses mainly on track changes rather than volume changes, but may share the same solution.

[Matthew Paul Thomas (mpt)]

Actually, bugs 1389761 and 1398888 are solely about the sound indicator. They don't cover the Sound settings, as in Wenfang's steps 3 and 4,