RFR: 8263402: MemoryLeak: Node hardreferences it's previous Parent after csslayout and getting removed from the scene [v4]

[Kevin Rushforth]

On Sun, 11 Apr 2021 15:44:39 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> Florian Kirmaier has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8263402
>>   Minor cleanup based on codereview
>
> It shouldn't be platform-specific, 
> but maybe there are some subtle differences 
> in the ordering between CSS/layout/rendering, which can cause OS-specific differences.
> 
> 
> As suggested, I've now changed the initial value also to be a WeakReference! 
> This way, it's definitely easier to reason that the code still behaves the same.

@FlorianKirmaier this is ready to integrate whenever you are ready.

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PR: https://git.openjdk.java.net/jfx/pull/424