xfce4-mixer has no session handler

[Brian J. Tarricone]

jp.guillemin wrote:
> Hi,
> 
> The xfce4-mixer window has no session support. I mean : if you launch it 
> several times (ie : by double clicking on the mixer panel applet) you 
> get 2 or more instances of the mixer simultaneously.
> 
> Obviously an application that has no reason to be loaded more than once 
> should have session support to detect that an instance is already 
> running and ignore repetitive launches.

This has nothing to do with session support, and... why does it matter? 
  Maybe sometimes you do want another instance of it, or maybe you just 
don't care either way.

	-brian