RFR: 8345188: Support tree-structural pseudo-classes [v10]

[John Hendrikx]

On Thu, 9 Jan 2025 21:48:52 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> > Note that you may not have choice where to insert, as the order of children also determines their Z ordering.
> 
> You can always prepare the required list in advance, and then `setAll` it.

I'm unsure how that would prevent issues.  It will then still require setting a pseudo class on all elements in the list, in addition to losing all other optimizations when the list is only shifted by a few elements...

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PR Comment: https://git.openjdk.org/jfx/pull/1652#issuecomment-2581311590