RFR: 8296653: ComboBox promptText is not displayed when the value is reset [v2]

[Ziad El Midaoui]

On Thu, 27 Nov 2025 14:42:18 GMT, Ziad El Midaoui <zelmidaoui at openjdk.org> wrote:

>> The issue occurred because the skin marks the button cell as “empty” when the value becomes null.
>> With the fix clearing the ComboBox value re-shows the prompt text.
>> Tested using the code present in the bug.
>
> Ziad El Midaoui has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Remove space
>  - Added Test and fixed comment

Updated the test with the suggestions proposed could you please re review.

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PR Comment: https://git.openjdk.org/jfx/pull/1989#issuecomment-3589769682