RFR: 8324941: POC for Headless platform for JavaFX [v2]

[Johan Vos]

On Thu, 19 Jun 2025 22:33:10 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Johan Vos has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix missing ;
>
> modules/javafx.graphics/src/main/java/com/sun/glass/ui/headless/HeadlessWindow.java line 36:
> 
>> 34:     private float alpha;
>> 35:     private Pixels icon;
>> 36:     private Cursor cursor;
> 
> The following fields are never used, other than assigning a value:
> * `ptr`
> * `resizable`
> * `visible`
> * `isFocusable`
> * `enabled`
> * `closed`
> * `bg_r`, `bg_g`, `bg_b`
> * `alpha`
> * `icon`
> * `cursor`

I had those since I think they might be useful "later", when we add more configuration options, or in case there are tests that rely on them. But I believe it is better indeed to remove them, and re-introduce them when needed.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1836#discussion_r2189230076