[jdk17u-dev] RFR: 8277396: [TESTBUG] In DefaultButtonModelCrashTest.java, frame is accessed from main thread

[Martin Doerr]

Clean backport of [JDK-8277396](https://bugs.openjdk.java.net/browse/JDK-8277396)

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Commit messages:
 - Backport b310f301efd5390408fb56b62cc09eb9a1604413

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/361/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=361&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277396
  Stats: 23 lines in 1 file changed: 9 ins; 8 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/361.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/361/head:pull/361

PR: https://git.openjdk.java.net/jdk17u-dev/pull/361