<Sound Dev> RFR: 8238567 SoftMainMixer.processAudioBuffers(): Wrong handling of stoppedMixers

[Sergey Bylokhov]

Hello.
Please review the fix for jdk/client.

Bug: https://bugs.openjdk.java.net/browse/JDK-8238567
Fix: http://cr.openjdk.java.net/~serb/8238567/webrev.00

The stoppedMixers Set contains the list of ModelChannelMixer, but we
tried to call stoppedMixers.contains/remove and pass SoftChannelMixerContainer
as a parameter. I was not able to trigger a bug by the test..


-- 
Best regards, Sergey.