[jdk11u-dev] RFR: 8233562: [TESTBUG] Swing StyledEditorKit test bug4506788.java fails on MacOS

[Christoph Langer]

Backport of JDK-8233562.

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Commit messages:
 - Backport 4107670d6210df16d5afd0ac7b8a7bab04a29c3b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/592/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=592&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233562
  Stats: 4 lines in 2 files changed: 1 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/592.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/592/head:pull/592

PR: https://git.openjdk.java.net/jdk11u-dev/pull/592