RFR: 8343336: Add reducedScrollBars preference

[Andy Goryachev]

On Thu, 31 Oct 2024 03:56:30 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> This PR adds another accessibility preference that is available on all supported desktop platforms:
> 
> 1. **Windows**: Settings -> Accessibility -> Visual Effects -> Always show scroll bars
> 2. **macOS**: System Settings -> Appearance -> Show scroll bars
> 3. **Ubuntu**: Settings -> Accessibility -> Seeing -> Always show scroll bars
> 
> When the OS setting is changed, all platforms report updates that can be observed in JavaFX.
> The manual test application `test/manual/events/PlatformPreferencesChangedTest` can be used to test the feature.

This looks like a useful data point.

I am curious as to what are the criteria for including or excluding a particular preference?  What is our long term goal - should we support all the preferences available on a particular platform, or the intersection, or what?  May be it's something to discuss first on the mailing list.

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PR Comment: https://git.openjdk.org/jfx/pull/1618#issuecomment-2450493039