[jdk11u-dev] RFR: 8159599: [TEST_BUG] java/awt/Modal/ModalInternalFrameTest/ModalInternalFrameTest.java

[Joshua Cao]

Backport for parity with Oracle.

Fix conflict in ProblemList.txt. Clean backport otherwise.

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Commit messages:
 - 8159599: [TEST_BUG] java/awt/Modal/ModalInternalFrameTest/ModalInternalFrameTest.java

Changes: https://git.openjdk.org/jdk11u-dev/pull/1430/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1430&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8159599
  Stats: 23 lines in 2 files changed: 13 ins; 3 del; 7 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1430.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1430/head:pull/1430

PR: https://git.openjdk.org/jdk11u-dev/pull/1430