RFR: 8288428: javax/swing/JInternalFrame/Test6505027.java fails frequently in MacOS 12 machines

Fri Jun 17 14:38:35 UTC 2022

javax/swing/JInternalFrame/Test6505027.java seems to be unstable in MacOS machines, especially in MacOSX 12 machines and it fails intermittently in CI causing some noise.
It seems to be a testbug as adding some stability improvements fix the issue.

Fix:
Some stability improvements have been done and the test has been run 10 times per platform in mach5 and got full PASS.

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Commit messages:
 - 8288428: javax/swing/JInternalFrame/Test6505027.java fails frequently in MacOS 12 machines

Changes: https://git.openjdk.org/jdk/pull/9202/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9202&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288428
  Stats: 38 lines in 1 file changed: 26 ins; 3 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/9202.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9202/head:pull/9202

PR: https://git.openjdk.org/jdk/pull/9202