RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621 [v9]

[Thiago Milczarek Sayao]

On Sun, 14 May 2023 12:47:53 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> I replicated the fix on #1054 on Linux.
>> 
>> Also fixes [Monocle: Stage no longer gets focus after fix for JDK-8296621](https://bugs.openjdk.org/browse/JDK-8304734)
>
> Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add manual test

I don't know why `ComboBoxTest.test_rt28245` was working before, but it had just an ENTER to select an element. I fixed it by using the combination of keys to select the first element.

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PR Comment: https://git.openjdk.org/jfx/pull/1110#issuecomment-1546990585