RFR: 8198402: ToggleButton.setToggleGroup causes memory leak when button is removed via ToggleGroup.getToggles()

[Jesper Skov]

On Thu, 9 Apr 2020 09:58:27 GMT, Jesper Skov <github.com+2720909+jskov at openjdk.org> wrote:

> Make the two ways of associating a ToggleButton with a ToggleGroup interact correctly.
> 
> This fixes https://bugs.openjdk.java.net/browse/JDK-8198402

/signed

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PR: https://git.openjdk.java.net/jfx/pull/167