RFR: 8277848 Binding and Unbinding to List leads to memory leak [v3]

[Florian Kirmaier]

On Wed, 5 Jan 2022 18:14:44 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> Making the initial listener of the ListProperty weak fixes the problem.
>> The same is fixed for Set and Map.
>> Due to a smart implementation, this is done without any performance drawback.
>> (The trick is to have an object, which is both the WeakReference and the Changelistener)
>> By implying the same trick to the InvalidationListener, this should even improve the performance of the collection properties.
>
> Florian Kirmaier has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8277848
>   Further optimization based code review.
>   This Bugfix should now event improve the performance

I've added the 3 requested whitespaces!
It sill would be great if CI could catch these minor problems.

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PR: https://git.openjdk.java.net/jfx/pull/689