RFR: 8090123: Items are no longer visible when collection is changed [v4]

[Karthik P K]

On Wed, 22 Feb 2023 11:08:39 GMT, Karthik P K <kpk at openjdk.org> wrote:

>> When a large number of items were scrolled in the `ChoiceBox`, the scrolled offset was carried forward when the list is replaced with small number of items. Hence the scroll up arrow was displayed with empty popup.
>> 
>> Changed code to scroll to top before popup display when content height of `ChoiceBox` is smaller than the scrolled offset.
>> 
>> Added system test to validate the fix.
>
> Karthik P K has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating test

Addressed Kevin's comments.

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PR: https://git.openjdk.org/jfx/pull/1039