[jdk21u-dev] RFR: 8328110: Allow simultaneous use of PassFailJFrame with split UI and additional windows

[Amos Shi]

Backport of [JDK-8328110](https://bugs.openjdk.org/browse/JDK-8328110)

Testing
- Local: Test passed
  - `PrintLatinCJKTest.java` (who calls `PassFailJFrame`): Test results: passed: 1
- Pipeline: 
- Testing Machine:

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Commit messages:
 - Backport 11a3673d42edbefef70228b4d14595aab11fdac4

Changes: https://git.openjdk.org/jdk21u-dev/pull/757/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=757&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328110
  Stats: 8 lines in 1 file changed: 0 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/757.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/757/head:pull/757

PR: https://git.openjdk.org/jdk21u-dev/pull/757