[jdk11u-dev] RFR: 8233556: [TESTBUG] JPopupMenu tests fail on MacOS

[Christoph Langer]

Backport of JDK-8233556.

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Commit messages:
 - Backport 3f8bd9230892a58ab8016eb746c9281d441ffe1c

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/570/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=570&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233556
  Stats: 31 lines in 4 files changed: 11 ins; 8 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/570.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/570/head:pull/570

PR: https://git.openjdk.java.net/jdk11u-dev/pull/570