[jdk11u-dev] RFR: 8294254: [macOS] javax/swing/plaf/aqua/CustomComboBoxFocusTest.java failure

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.
Skipped change to ProblemList as the test is not listed in 17. Will mark clean.

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Commit messages:
 - Backport 358ac07255cc640cbcb9b0df5302d97891a34087

Changes: https://git.openjdk.org/jdk11u-dev/pull/2386/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2386&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294254
  Stats: 7 lines in 2 files changed: 2 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2386.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2386/head:pull/2386

PR: https://git.openjdk.org/jdk11u-dev/pull/2386