RFR: 8294809: ListenerHelper for managing and disconnecting listeners [v12]

[Andy Goryachev]

On Wed, 23 Nov 2022 16:03:44 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Agreed.
>
> any suggestions?  Disconnectable?   HasDisconnect?

will decide later

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PR: https://git.openjdk.org/jfx/pull/908