[jdk11u-dev] RFR: 8233550: [TESTBUG] JTree tests fail regularly on MacOS

[Christoph Langer]

Backport of 8233550: [TESTBUG] JTree tests fail regularly on MacOS

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Commit messages:
 - Backport 04b3bf60245a1f1780ab906da14fc59466b4b381

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/523/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=523&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233550
  Stats: 210 lines in 4 files changed: 53 ins; 4 del; 153 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/523.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/523/head:pull/523

PR: https://git.openjdk.java.net/jdk11u-dev/pull/523