RFR: 8242001: ChoiceBox: must update value on setting SelectionModel, part2

[Ajit Ghaisas]

On Tue, 5 May 2020 10:50:40 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> The issue is that ChoiceBox didn't sync its value to the replaced SelectionModel's selectedItem if the item is null.
> 
> Fixed by removing the constraint from selectionModel property.
> 
> Added tests that failed before and passed after the fix. Note that I also changed a test method in ChoiceBoxTest with
> an incorrect test assumption (which passed for the incorrect implementation).

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/207