RFR: 8190329: [macos] Swing InterOp Platform.exit() crash

[Prasanta Sadhukhan]

The testcase calls Platform.exit before the dialog is made visible but
on macOS, JavaFX takes over the AppKit thread and uses that as the FX application thread. As part of the FX platform shutdown process, it detaches that thread from the JVM. This means that the AppKit thread is no longer available to Java processes
so AWT crashes when it ties to access appkit thread.
Fix is made to check if the thread has been detached for move-resize notification event before proceeding..

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Commit messages:
 - 8190329: [macos] Swing InterOp Platform.exit() crash

Changes: https://git.openjdk.org/jdk/pull/20688/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20688&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8190329
  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20688.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20688/head:pull/20688

PR: https://git.openjdk.org/jdk/pull/20688