RFR: 8343196: Add build property to identify experimental builds of JavaFX [v2]

[Johan Vos]

On Sat, 16 Nov 2024 16:16:58 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> > I might be confused, but wasn't the idea to use a new property (e.g. jfx.feature.variant) instead of overloading the existing jfx.release.suffix?
> 
> This PR does add a new property in `build.properties`,`jfx.experimental.release.suffix`, and does not require modifying `jfx.release.suffix`. For example, in the "metal" branch of the jfx-sandbox, we would define this as:
> 
> ```
> jfx.experimental.release.suffix=-metal
> ```

My apologies, I misread the proposed code. 
It is a bit confusing to have "jfx.release.suffix" and "jfx.experimental.release.suffix" where the former refers to an artifact property and the latter refers to a major feature/variant/... like metal. But then, consistent naming is always difficult so I'm ok with the proposed suggestion.

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PR Comment: https://git.openjdk.org/jfx/pull/1637#issuecomment-2480728513