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

[Andy Goryachev]

On Fri, 17 Feb 2023 12:33:31 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.

FYI: added ChoiceBox to the monkey tester
https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/monkey/MonkeyTesterApp.java

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