RFR: 8254956: [REDO] Memoryleak: Closed focused Stages are not collected with Monocle

[Kevin Rushforth]

On Tue, 23 Nov 2021 11:00:51 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

> This PR fixes a memory leak, as a follow-up of [JDK-8241840](https://bugs.openjdk.java.net/browse/JDK-8241840).
> 
> The tests pass on desktop (Linux/macOS/Windows) and there is no regression on Android (see [JDK-8254605](https://bugs.openjdk.java.net/browse/JDK-8254605)).

This was my mistake -- well, actually, an unfortunate design choice by gradle, but one I'm so familiar with I'm surprised I got bit by it. gradle will not rerun a test if it thinks the tests are up-to-date, and that's exactly what happened to me. Twice. This is why when I run individual tests, I (almost) always add the `cleanTest` target. When I do that, it fails for me, too, without your fix.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.java.net/jfx/pull/677