Verion 2.27.91
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- gnome-volume-control
  + Fix warnings when a volume changes, and the
    stream doesn't have a UI
  + Fix crash when the default sink goes away
  + Fix receiving multiple events when a volume bar is changed
  + Fix the output volume bar becoming unsensitive when the
    selected output goes away
  + Don't change PulseAudio's volume when we receive events
    from PulseAudio
  + Only change PulseAudio's volume if the volume hasn't already
    been set to that value
  + Differentiate the various mixer controls in PulseAudio's
    output

- gst-mixer
  + Fix a crash in gnome_volume_control_element_whitelist()

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