RFR: 8241999: ChoiceBox: incorrect toggle selected for uncontained

[Kevin Rushforth]

On Tue, 28 Apr 2020 15:36:53 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> The issue is that the toggles is not reliably unselected if an uncontained value is set.
> 
> The root is ChoiceBoxSelectionModel which doesn't update the index on selecting an uncontained item, in particular it
> fails to keep the invariant:
>      assertEquals(getItems().indexOf(selectedItem), selectedIndex);
> 
> The fix here is to override select(item) to guarantee the assert.
> 
> Added/removed ignore from tests that failed before and pass after the fix. All other tests are passing before and after.

@aghaisas can you review this? It looks pretty simple so one reviewer should be enough, unless you spot something where
you want a second pair of eyes.

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PR: https://git.openjdk.java.net/jfx/pull/200