[jdk8u-dev] RFR: 8222323: ChildAlwaysOnTopTest.java fails with "RuntimeException: Failed to unset alwaysOnTop"

[Taizo Kurashige]

Hi,

This is a backport of JDK-8222323: ChildAlwaysOnTopTest.java fails with "RuntimeException: Failed to unset alwaysOnTop"

Original patch does not apply cleanly to JDK-8021961 applied code, because the fix uses "StringBuffer.isEmpty()" published in JDK15. I fixed the test so as not to use "StringBuffer.isEmpty()".

Testing: jdk_awt on RHEL7, GHA testing

Thanks.

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Depends on: https://git.openjdk.org/jdk8u-dev/pull/377

Commit messages:
 - Backport 837928ba7955dbfd4a9c966209c3469c0fb5e195

Changes: https://git.openjdk.org/jdk8u-dev/pull/378/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=378&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8222323
  Stats: 224 lines in 1 file changed: 128 ins; 32 del; 64 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/378.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/378/head:pull/378

PR: https://git.openjdk.org/jdk8u-dev/pull/378