RFR: 8343336: Add persistentScrollBars preference [v6]

[Kevin Rushforth]

On Wed, 27 Nov 2024 13:50:11 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> modules/javafx.graphics/src/main/native-glass/gtk/PlatformSupport.cpp line 125:
>> 
>>> 123:         putBoolean(env, prefs, "GTK.enable_animations", enableAnimations);
>>> 124: 
>>> 125:         if (g_object_class_find_property(G_OBJECT_GET_CLASS(settings), "gtk-overlay-scrolling")) {
>> 
>> Looks good, presuming that we want the property to be absent on systems that don't support this setting.
>
> Yes, a property that isn't available shouldn't be included in the preferences map. We've documented that in `Platform.Preferences`:
> 
>      * The preferences that are reported by the platform may be dependent on the operating system version
>      * and its current configuration, so applications should not assume that a particular preference is
>      * always available.

Yes, so this is fine.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1618#discussion_r1860705373