RFR: 8325564: ComboBox popup does not correctly resize after update when on display [v4]

[Andy Goryachev]

On Mon, 2 Feb 2026 18:17:38 GMT, Ziad El Midaoui <zelmidaoui at openjdk.org> wrote:

>> Fixed popup size not changing to show more items or less when changing the number of items in `ComboBox` by adding a `popupResize` variable which triggers a request layout when there is change in items list.
>> Tested with the test app in bug and MonkeyTester.
>
> Ziad El Midaoui has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix scrollbar issue

Looks much better!

Two things:
1. please change the copyright year to 2026
2. noticed runLater() in `recomputePopupLayout()`, so I decided to apply CSS to the popup.  You can use
https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/bugs/ComboBox_PopupSize_8325564.java

On my primary retina display I get the scrollbars first time around.  The scrollbars disappear on second showing:

<img width="310" height="391" alt="Screenshot 2026-02-02 at 15 05 29" src="https://github.com/user-attachments/assets/ae5f149a-c845-4f5f-8ed6-5ffa404aed54" />


.combo-box-popup > .list-view {
    -fx-padding: 100px
}

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PR Comment: https://git.openjdk.org/jfx/pull/2052#issuecomment-3837743037