RFR: 8310024: Skip failing scene change tests on macOS

[Andy Goryachev]

On Wed, 14 Jun 2023 13:39:52 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Simple fix to skip two failing tests on macOS until the underlying bugs are fixed:
> 
> SceneChangeEventsTest::testSceneChange -- [JDK-8300094](https://bugs.openjdk.org/browse/JDK-8300094)
> SceneChangeShouldNotFocusStageTest::windowShouldRemainIconified -- [JDK-8305675](https://bugs.openjdk.org/browse/JDK-8305675)
> 
> With this patch, we now get a clean test run on macOS 12 and 13.

tests/system/src/test/java/test/robot/javafx/scene/SceneChangeShouldNotFocusStageTest.java line 69:

> 67:     public static void exit() {
> 68:         if (stage != null) {
> 69:             Util.shutdown(stage);

I wonder if we should move the null check to Util.shutdown() to make things easier

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PR Review Comment: https://git.openjdk.org/jfx/pull/1153#discussion_r1229822503