[jdk11u-dev] RFR: 8287876: The recently de-problemlisted TestTitledBorderLeak test is unstable

[Goetz Lindenmaier]

I backport this to fix an issue we see in our nighly tests.

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Commit messages:
 - Backport bf439f8c93157a7f0e6489db2ccc56c5f7210402

Changes: https://git.openjdk.org/jdk11u-dev/pull/1912/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1912&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287876
  Stats: 36 lines in 1 file changed: 5 ins; 18 del; 13 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1912.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1912/head:pull/1912

PR: https://git.openjdk.org/jdk11u-dev/pull/1912