[jdk11u-dev] RFR: 8233567: [TESTBUG] FocusSubRequestTest.java fails on macos

[Martin Doerr]

Clean backport of JDK-8233567.

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Commit messages:
 - Backport b90ad76d6b8a4b2096ae096252dead9626d7e09b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/551/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=551&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233567
  Stats: 13 lines in 2 files changed: 3 ins; 2 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/551.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/551/head:pull/551

PR: https://git.openjdk.java.net/jdk11u-dev/pull/551