RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621 [v15]

[Thiago Milczarek Sayao]

On Sat, 3 Jun 2023 21:21:54 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 58 additional commits since the last revision:
> 
>  - Merge branch 'master' into change_scene_fix
>  - Can't get size before process_configure
>  - Fix MouseEventFirerTest.java
>  - Merge branch 'master' into change_scene_fix
>  - Antecipate request focus
>  - Merge branch 'master' into change_scene_fix
>  - Fix ComboBoxTest
>  - Add manual test
>  - Merge branch 'master' into change_scene_fix
>  - Merge branch 'openjdk:master' into master
>  - ... and 48 more: https://git.openjdk.org/jfx/compare/0144a73a...849d5dc3

For some reason `Platform.startup` is hanging and any test that uses it gets stuck.

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PR Comment: https://git.openjdk.org/jfx/pull/1110#issuecomment-1575232210