[jdk11u-dev] RFR: 8233564: [TESTBUG] MouseComboBoxTest.java is failing

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

I had to resolve the ProblemList due to context.

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Commit messages:
 - Backport b72d99e77b71e495fe66026f692f28d5407235ce

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/422/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=422&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233564
  Stats: 6 lines in 2 files changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/422.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/422/head:pull/422

PR: https://git.openjdk.java.net/jdk11u-dev/pull/422