[Rev 06] RFR: 8236259: MemoryLeak in ProgressIndicator

[Florian Kirmaier]

On Fri, 1 May 2020 15:05:26 GMT, Jesper Skov <github.com+2720909+jskov at openjdk.org> wrote:

>> @FlorianKirmaier
>> Please integrate this PR by issuing `/integrate` command in a new comment. After that one of us can sponsor it.
>
> @FlorianKirmaier  did you want to persue a common shared in-tree GC testing facility?
> 
> Otherwise I would like to give it a shot (I have also just added another copy of the attemptGC method to a test).

@jskov
Thank you for the reminder.
I've updated and improved my [JMemoryBuddy](https://github.com/Sandec/JMemoryBuddy), and now I'm working on a PR for
JavaFX add it based on the feedback of this PR and simplifies various tests.

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PR: https://git.openjdk.java.net/jfx/pull/71