Indicator-sound's menu looks different on Cairo-Dock applet

Hello,

This bug is maybe not due to Indicator-Sound but since this indicator has been ported to a "service" (since we have to load /usr/share/unity/indicators/com.canonical.indicator.sound), its menu looks different when using it with Cairo-Dock or with indicator-loader.
As you can see on the screenshot (indicator-sound_loader-vs-cairo-dock.png), players menu entries reserve more spaces with Cairo-Dock.

Note: ido_init() has been called once and these new indicators are loaded with "desktop" profile.
More info: https://bazaar.launchpad.net/~cairo-dock-team/cairo-dock-plug-ins/plug-ins/view/head:/Indicator-applet3/indicator-applet3.c#L29
The code is not so big and not so different than indicator-loader: https://bazaar.launchpad.net/~indicator-applet-developers/libindicator/trunk.13.10/view/head:/tools/indicator-loader.c
The dock just loads the applet and popup the menu (IndicatorObjectEntry->menu)

Any idea of what is wrong? :)

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: indicator-sound 12.10.2+13.10.20130725-0ubuntu1
ProcVersionSignature: Ubuntu 3.10.0-5.14-generic 3.10.2
Uname: Linux 3.10.0-5-generic x86_64
ApportVersion: 2.11-0ubuntu1
Architecture: amd64
Date: Thu Jul 25 19:43:46 2013
InstallationDate: Installed on 2011-08-10 (715 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
MarkForUpload: True
SourcePackage: indicator-sound
UpgradeStatus: No upgrade log present (probably fresh install)