RFR: 8296653: ComboBox promptText is not displayed when the value is reset [v3]

[Ambarish Rapte]

On Fri, 28 Nov 2025 15:50:23 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 one additional commit since the last revision:
> 
>   Fixed test

lgtm+..

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Marked as reviewed by arapte (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1989#pullrequestreview-3523856091