RFR: 8271395: Fixing crash at printing [v2]

[Phil Race]

On Wed, 8 Sep 2021 07:52:31 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> This PR switches the Thread to the QuantumRenderer, in the case the Disposer is called from another Thread - the printing Thread.
>> I'm open for better solutions on how to fix this Issue.
>> Initially i thought there is also a Race Condition in the resource pool, but a new one is created for the Printing Thread.
>
> Florian Kirmaier has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8271395
>   QuantumRenderer is no longer public

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.org/jfx/pull/618