RFR: 8260013: Snapshot does not work for nodes in a subscene [v4]

[Kevin Rushforth]

On Mon, 29 Jan 2024 09:32:06 GMT, Lukasz Kostyra <lkostyra at openjdk.org> wrote:

>> Originally this issue showed the problem of Node being incorrectly rendered (clipped) when snapshotting, compared to a snapshot of the whole Scene. Later on there was another problem added - lights not being taken into account if they are added to a SubScene.
>> 
>> As it later turned out, the original problem from this bug report is a problem with ParallelCamera incorrectly estimating near/far clipping planes, which just happened to reveal itself while snapshotting a Node. During testing I found out you can make the Node clip regardless of snapshot mechanism. Clipping issue was moved to a separate bug report and this PR only fixes the inconsistency in lights being gathered for a snapshot.
>> 
>> `Scene.doSnapshot()` was expanded to also check if SubScene provided to it is non-null and to fetch lights assigned to it. Scenario was tested with added SnapshotLightsTest.
>> 
>> Rest of the tests were checked and don't produce any noticeable regressions.
>
> Lukasz Kostyra has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Minor review adjustments

Marked as reviewed by kcr (Lead).

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PR Review: https://git.openjdk.org/jfx/pull/1332#pullrequestreview-1849876151