[Bug 48660] Opening "Volume Control" makes the Volume Applet behave differently

[agro1986]

Public bug reported:

When the "Volume Control" is not opened, hovering the volume applet (the
speaker icon on the top right corner) and then rolling the mouse wheel
down will reduce the sound volume. Eventually the sound will be muted.
Rolling the mouse wheel up will unmute and increase the sound volume.

However, if the "Volume Control" is opened (right click the volume
applet and then choose "Open Volume Control") and then we mute the sound
using the previously described method, we can't unmute it by using the
(also) previously defined method.

** Affects: gnome-panel (Ubuntu)
     Importance: Medium
         Status: Unconfirmed

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Opening "Volume Control" makes the Volume Applet behave differently
https://launchpad.net/bugs/48660