On Tue, 22 Jul 2025 00:05:35 GMT, John Hendrikx <jhendr...@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.

modules/javafx.graphics/src/main/java/javafx/scene/layout/BorderPane.java line 
630:

> 628:             Insets margin = getNodeMargin(child);
> 629:             return minimum ? computeChildMinAreaHeight(child, -1, 
> margin, width, true):
> 630:                                    computeChildPrefAreaHeight(child, -1, 
> margin, width, true);

Note: before the last boolean parameter was introduced in the 
`computeChildXXXAreaHeight` functions in `Region`, the default behavior was to 
have fill width set to `true`.  The reason I picked `false` is because the 
calculation above in `getAreaWidth` was using `false`, but it looks now that 
this was never correct.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1850#discussion_r2220620965

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