Middle-clicking on the Mixer panel item of a non-mute-able track

[Jarno Suni]

This is just for those who are interested in how the sound mixer plugin
works and how it should work in Xfce 4.6. 

The linked video demonstrates the effect of middle-clicking on current
mixer plugin. Please note that the last middle click has different
effect; it has something to do with QAMix running there:
http://www.iki.fi/8/test/xfce-sound-mixer-panel-plugin-unmute-behavior.ogv

I am not aware of any official specification on how middle-clicking
should work for non-mute-able tracks, but the panel item should not
show wrong volume level of its track.

-- 
Jarno Suni - http://iki.fi/8/ 
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