RFR: 8349105: Pagination: exception initializing in a background thread [v4]

[Andy Goryachev]

On Mon, 10 Feb 2025 22:30:32 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> ## Root Cause
>> Animation gets started in a background thread, which causes the animation handler to run in the FX application thread, thus creating simultaneous access to the control's fields (list of children in this case).
>> 
>> ## Solution
>> Postpone the animation unless running in the FX application thread.  There is no functional difference if the component is created/used in the FX application thread.
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   slow down gc

For testing purposes, merged this PR with the memory leak fix https://github.com/openjdk/jfx/pull/1705 .  Once the latter is integrated, unrelated changes will disappear.

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PR Comment: https://git.openjdk.org/jfx/pull/1698#issuecomment-2652292591