When changing volume with slide bar, only specific volumes are allowed

Hi

Since I have installed Xubuntu 17.04, I have noticed that I can choose only predefined volumes with the slide bar which appears when clicking on the indicator. This was not the behavior on Xubuntu Xenial.

I have tested with pavucontrol and xfce4-pulseaudio-plugin and with them I can choose freely any value within the slide bar.

Expected behavior: when changing the volume with the sliding bar, I would be able to choose any value possible within the slide bar.

Observed behavior: the values are in a 10% interval, so there are only 11 possible positions: 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: indicator-sound 12.10.2+17.04.20170328.1-0ubuntu1
Uname: Linux 4.11.7-041107-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Jun 26 22:52:40 2017
InstallationDate: Installed on 2017-06-13 (13 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: indicator-sound
UpgradeStatus: No upgrade log present (probably fresh install)