RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621 [v13]

[Kevin Rushforth]

On Sat, 20 May 2023 16:17:50 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

> About the `testAnchorRight` test: I know what happened, it's the focus shadow of the button `topLeft` - it was the first child of the AnchorPane, so it got the focus and hence the difference in the value. Moving it in the Scene graph fixed it (because it does not get the primary focus).

This means that there will be a sometimes-noticeable difference in behavior between JavaFX 19 (before the fix for [JDK-8296621](https://bugs.openjdk.org/browse/JDK-8296621)) and JavaFX 21 (after this fix for [JDK-8306121](https://bugs.openjdk.org/browse/JDK-8306121)). I don't think this is a problem, but I'd like to take a closer look.

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PR Comment: https://git.openjdk.org/jfx/pull/1110#issuecomment-1572228570