RFR: 8301302: Platform preferences API [v5]

[Andy Goryachev]

On Fri, 8 Sep 2023 05:16:35 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> The set of preferences that is reported by a platform is hard-coded in the native platform implementation, and depends on the operating system version. It might indeed be the case that an OS upgrade/downgrade could result in a different set of reported properties, but can this happen while a JavaFX applications remains running?
>> 
>> In any case, even if that were to happen, the current behavior is that a preference that was once reported will not be removed.
>
> Looks like I spoke too soon. Mappings can actually be removed at runtime, one such example is `Windows.SPI.HighContrastColorScheme`, which is only available if `Windows.SPI.HighContrast` is `true`.
> 
> This doesn't change the `ChangedValue` implementation, and there are tests that cover the key removal scenario.

if that's the case, isn't it possible to have the same key added at runtime?  this scenario cannot be handled by the current code, as far as I can tell.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1014#discussion_r1319949413