RFR: 8266643: Intermittent failure of HonorDeveloperSettingsTest unit test

[Kevin Rushforth]

On Wed, 12 May 2021 11:53:16 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> The test fails intermittently on github build. But I do not observe this issue locally on my Ubuntu20.04 VM.
> I am suspecting that the reason of failure is that the test are not cleaned up correctly. The changes in this PR cleans up the test, by removing all children added to root and hiding the stage.

Looks good. In addition to testing this locally, I kicked off two GitHub actions builds (the Linux systems used by GitHub actions is are the only systems on which we've seen this fail), and both passed.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.java.net/jfx/pull/496