[jdk11u-dev] RFR: 8199079: Test javax/swing/UIDefaults/6302464/bug6302464.java is unstable

[Martin Doerr]

Basically clean backport of JDK-8199079. I only had to remove the test from the problem list manually due to different context.

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Commit messages:
- 8199079: Test javax/swing/UIDefaults/6302464/bug6302464.java is unstable

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/697/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=697&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8199079
Stats: 29 lines in 2 files changed: 21 ins; 1 del; 7 mod
Patch: https://git.openjdk.java.net/jdk11u-dev/pull/697.diff
Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/697/head:pull/697

PR: https://git.openjdk.java.net/jdk11u-dev/pull/697