RFR: 8290037: Bindings should clean up after themselves when their weak listeners go out of scope

[Kevin Rushforth]

On Thu, 14 Jul 2022 14:48:14 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> This is an initial (incomplete) implementation of 8290037 for evaluation.
> 
> If the approach is agreed, I will modify the rest of the `*PropertyBase` classes which use weak listeners, and add some tests.
> 
> I didn't use `Cleaner` because cleaning up a listener may block.

If we go this route it warrants updates to the API docs to describe the behavioral changes being introduced. Specifically, the synchronizing of the add / remove listener methods and any changes to the lifecycle of the bindings.

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PR: https://git.openjdk.org/jfx/pull/827