[Pidgin] #17333: unwanted system sound levels raises when buddy changes status or message 2.12.0

[Pidgin]

#17333: unwanted system sound levels raises when buddy changes status or message
2.12.0
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 Reporter:  galen   |      Owner:  EionRobb
     Type:  defect  |     Status:  new
Milestone:          |  Component:  unclassified
  Version:  2.12.0  |   Keywords:  sound
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 version 2.12.0
 sound notifications are on and set to quiet.
 Problem. When message arrives / buddy status changes , Pidgin will boost
 the system sound level to 81% or so

 Nothing abnormal in logs.

 System:
   Host: jersey-mx Kernel: 4.13.0-1-amd64 x86_64 bits: 64
   Desktop: Xfce 4.12.3 Distro: MX-17.1_x64 Horizon December 15, 2017

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Ticket URL: <https://developer.pidgin.im/ticket/17333>
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