RFR: 8338145: ComboBox popup is in wrong location on first showing

[Andy Goryachev]

On Mon, 19 Jan 2026 11:37:20 GMT, Christopher Schnick <duke at openjdk.org> wrote:

> The resize method in the combo box skin does not take into account whether the popup was autofixed or not. This causes a wrong position if the content size is changed, which it often is on initial show.
> 
> If anyone has a better idea how to actually determine whether a popup was autofixed, then I can improve the check. Currently it relies purely on the popup position and the combo box position.
> 
> I tested this fix manually on Windows with a reproducer and it works as expected there

The fix does not look right, perhaps we need to change the auto-fix code instead.

Here is what I see on macOS using these steps:

- open the reproducer
- move the window down such that the combo box bottom edge goes beyond the lower screen boundary
- click to show the popup
==> the popup appears way too high:

<img width="222" height="175" alt="Screenshot 2026-01-20 at 10 58 33" src="https://github.com/user-attachments/assets/0a98257f-1305-4940-84ee-79fce74fce5a" />

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PR Comment: https://git.openjdk.org/jfx/pull/2044#issuecomment-3774480821