RFR: 8362873: Regression in BorderPane after JDK-8350149

[Andy Goryachev]

On Tue, 22 Jul 2025 00:05:35 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> This PR fixes a regression introduced in #1723
> 
> It reverts the changes made in the BorderPaneTest with new comments explaining why the values are what they are.  It only fixes the regression that was introduced, but it can be said that the calculation is probably also incorrect when a vertical biased control is encountered (the `getAreaWidth` and `getAreaHeight` in `BorderPane` were, and are still not using the same way to calculate their respective sizes).  See the ticket for more details and screenshots.
> 
> Let me know if I should only address the regression introduced, or also include the fix for the bias calculation for vertical bias controls.

Marked as reviewed by angorya (Reviewer).

This PR fixes the vertical layout case (`verticalLayout = true;`).

Do we have a ticket for the incorrect computation for the horizontal layout?  If not, could you please create a follow-up one?

<img width="861" height="816" alt="Screenshot 2025-07-22 at 09 08 16" src="https://github.com/user-attachments/assets/a7604eae-65c3-46cd-8d02-06b9cf531e08" />

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PR Review: https://git.openjdk.org/jfx/pull/1850#pullrequestreview-3043780478
PR Comment: https://git.openjdk.org/jfx/pull/1850#issuecomment-3103612681