RFR: 8349098: TabPane: exception initializing in a background thread

[Kevin Rushforth]

On Thu, 6 Feb 2025 23:20:30 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
> Skip the animation.
> 
> The fix is similar to https://github.com/openjdk/jfx/pull/1698

Reviewer: @arapte

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PR Comment: https://git.openjdk.org/jfx/pull/1699#issuecomment-2643524697