RFR: 8178698: javax/sound/midi/Sequencer/MetaCallback.java failed with timeout

[Alexander Zuev]

On m1 mac sometimes (in very rare instance) it takes a long time to get the sequencer so increasing timeout helps with that.
Also on m1 mac sequencer got notified about the first MetaMessage twice. The reason is unclear but watching for that fixes the problem. Also on Linux sometimes process hangs indefinitely without finishing hold by the com.sun.media.sound.MediaDispatcher. Closing the sequencer at the end of the test helps with that.

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Commit messages:
 - Handle case when on m1 mac handler being called twice on the same message in the beginning of playback
 - 8178698: javax/sound/midi/Sequencer/MetaCallback.java failed with timeout

Changes: https://git.openjdk.org/jdk/pull/11157/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11157&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8178698
  Stats: 14 lines in 2 files changed: 9 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/11157.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11157/head:pull/11157

PR: https://git.openjdk.org/jdk/pull/11157