RFR: 8267621: Mark HonorDeveloperSettingsTest.testOpacityWithManuallyChangedValueAndInlineStyleIsSetToInlineStyle as unstable

[Kevin Rushforth]

On Mon, 24 May 2021 16:48:57 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> The test HonorDeveloperSettingsTest.testOpacityWithManuallyChangedValueAndInlineStyleIsSetToInlineStyle is failing intermittently only on GHA build on Linux platform. see: [JDK-8267425](https://bugs.openjdk.java.net/browse/JDK-8267425)
> 
> A fix proposed at #509 is a potential fix which adds cleanup of test. But we do not know the root cause of this failure.
> Identifying the root cause may take longer which we might push that to next test sprint and the test failure results in failing the Github checks on PR.  So we need to mark this test as unstable.
> As of now the test fails only on Linux so we will mark it unstable only for Linux.

Since the NPE is happening in the `setUp` method, which is annotated with `@Before` and runs before the test itself, it seems unlikely that marking just a single test method as unstable is sufficient.

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PR: https://git.openjdk.java.net/jfx/pull/517