RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621 [v5]

[Jose Pereda]

On Tue, 25 Apr 2023 00:31:07 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> That seems good enough to verify that the window doesn't stay showing.
>
> @kevinrushforth I was checking and `SceneChangeShouldNotFocusStageTest` added on [JDK-8296621](https://bugs.openjdk.org/browse/JDK-8296621) does exactly that.
> 
> But I noticed the same as you described on [JDK-8298500](https://bugs.openjdk.org/browse/JDK-8298500).
> 
> @jperedadnr The `WinIconified.java` attached is to show that a window should stay iconified and that it is initially iconified (does not pop on the screen and then gets iconified).

@tsayao thanks, and just for my understanding, do you intent to add WinIconified test to this PR, as system or manual test?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1110#discussion_r1179455018