RFR: 8241840: Memoryleak: Closed focused Stages are not collected with Monocle. [v5]

[Kevin Rushforth]

On Sun, 9 Aug 2020 17:11:27 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> tests/system/src/test/java/test/javafx/stage/FocusedWindowTestBase.java line 60:
>> 
>>> 59:     static WeakReference<Stage> closedFocusedStageWeak = null;
>>> 60:     static Stage closedFocusedStage = null;
>>> 61:
>> 
>> These two can be instance fields (which is usually preferred for test variables).
>
> They are called from the following static method:
>     @BeforeClass
>     public static void initFX() throws Exception {
>         initFXBase();
>     }

No, these two are only used from `testClosedFocusedStageLeakBase`, which is an instance method. I removed `static`
while testing it and it compiles and runs fine.

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PR: https://git.openjdk.java.net/jfx/pull/153