RFR: 8313956: focusWithin on parents of a newly-added focused node is not updated [v4]

[Michael Strauß]

On Fri, 18 Aug 2023 20:55:23 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> question: what happens when the user navigates away when editing the cell? it looks like the fix correctly handles the situation. are there any other possible scenarios?

I don't think there are, because now we're correctly handling the two scenarios that affect the `focusWithin` count:
1. Removing a non-zero focusWithin node from the scene graph
2. Adding a non-zero focusWithin node from the scene graph

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PR Comment: https://git.openjdk.org/jfx/pull/1210#issuecomment-1684442966