RFR: 8279640: ListView with null SelectionModel/FocusModel throws NPE

[Marius Hanl]

On Thu, 4 Aug 2022 21:29:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> As I mentioned in that JBS issue, I tend to agree that if we were starting today with a blank sheet of paper, we might have disallowed null and defined a "noop" selection model and/or focus model. At this point, though, it would be a breaking change, even though we don't specify the behavior of null, so we ought to make it work in those places where it doesn't.

I agree, if we could do it from scratch we can just implement something like a `NonNullObjectProperty` which won't allow null in some way. Or the JDK implements some way of declaring a variable as not nullable. 😃 

And I agree that improving the docs makes sense and more information is always good.

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PR: https://git.openjdk.org/jfx/pull/711