RFR: 8239822: Intermittent unit test failures in RegionCSSTest

[Kevin Rushforth]

On Mon, 24 Feb 2020 16:00:31 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> test.javafx.css.Node_cssStateTransition_Test may also need the same treatment.
> 
> Thanks for pointing that out. In addition to `test.javafx.css.Node_cssStateTransition_Test`, the following test has a similar pattern:
> 
> test.com.sun.javafx.css.StyleManagerTest
> 
> I'll update the PR to fix the above two.
> 
> I looked further, and see that the following tests call `StyleManager::setDefaultUserAgentStylesheet`:
> 
> test/javafx/css/CssMetaDataTest
> test/javafx/css/HonorDeveloperSettingsTest
> test/javafx/css/Node_cssStateTransition_Test
> test/javafx/css/Node_cssStyleMap_Test
> test/javafx/scene/Node_effectiveOrientation_Css_Test
> 
> This is a slightly different case, and none of these are causing problems today, so I will file a follow-up test bug to look at those and see if they need cleanup.

I filed [JDK-8239880](https://bugs.openjdk.java.net/browse/JDK-8239880) to track fixing the above 5 test classes.

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PR: https://git.openjdk.java.net/jfx/pull/124