[jdk8u-dev] RFR: 8222323: ChildAlwaysOnTopTest.java fails with "RuntimeException: Failed to unset alwaysOnTop" [v2]

[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.

Taizo Kurashige has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/378/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/378/files/ce74df4e..ce74df4e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=378&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=378&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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