[jdk11u-dev] RFR: 8233560: [TESTBUG] ToolTipManager/Test6256140.java is failing on macos

[Christoph Langer]

Backport of JDK-8233560.

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Commit messages:
 - Backport caec8d2208fea0ddd4387a4530b4914645482377

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/585/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=585&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233560
  Stats: 60 lines in 2 files changed: 23 ins; 15 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/585.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/585/head:pull/585

PR: https://git.openjdk.java.net/jdk11u-dev/pull/585