RFR: 8264330: Scene MouseHandler is referencing removed nodes [v2]

[John Hendrikx]

On Wed, 31 Mar 2021 21:16:29 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> modules/javafx.graphics/src/test/java/test/javafx/scene/SceneTest.java line 1019:
>> 
>>> 1017:         pane = null;
>>> 1018: 
>>> 1019:         System.gc();
>> 
>> It is not sufficient to call `System.gc()` only once, since it will make for a fragile test. I recommend using the `JMemoryBuddy::assertCollectable` for this, which is what we are using for new tests.
>
> This tool is in javafx.base's test folder, and it is not allowing me to reference it.  I'm not quite sure how to change the project to allow this.

Added reference in build.gradle and used the tool as suggested.

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PR: https://git.openjdk.java.net/jfx/pull/448