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

[Thiago Milczarek Sayao]

On Thu, 27 Apr 2023 16:55:29 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> @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?

`SceneChangeShouldNotFocusStageTest` covers the test that the window should start iconified. It does not cover the test where the window pops and then iconifies (causing a visual "weirdness"). I don't think the later is possible on a systemTest.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1110#discussion_r1186745917