[jdk11u-dev] RFR: 8242526: PIT: javax/swing/JInternalFrame/8020708/bug8020708.java fails in mach5 ubuntu system

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

Test passes. Even the ProblemList patch applied clean!

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Commit messages:
 - Backport 8b002d881dc46636d5e9b172ed3566674c6a4eeb

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/398/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=398&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242526
  Stats: 12 lines in 2 files changed: 3 ins; 3 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/398.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/398/head:pull/398

PR: https://git.openjdk.java.net/jdk11u-dev/pull/398