RFR: 8324658: Allow animation play/start/stop/pause methods to be called on any thread

[Kevin Rushforth]

On Sat, 27 Jan 2024 00:07:21 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> The tests from [JDK-8159048](https://bugs.openjdk.org/browse/JDK-8159048) should either be removed or reworked. @kevinrushforth Should I just check that calling the specified methods both from the FX thread and from a background thread end up executing on the FX thread?

Checking that the animation always runs on the FX thread seems useful. It might also be worth adding a test based on the original reproducer in [JDK-8159048](https://bugs.openjdk.org/browse/JDK-8159048).
 
> Running `./gradlew :systemTests:test --tests test.com.sun.javafx.animation.AnimationTest` still succeeds for me for some reason even after a clean. Is there something missing here?

The system tests are only run if `-PFULL_TEST=true` is passed to gradle.

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PR Comment: https://git.openjdk.org/jfx/pull/1352#issuecomment-1913173972