Expose accent color in Granite.Settings

[cassidyjames]

Similar to #319. Requires elementary/default-settings#175.

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[danirabbit]

Hm I’m not sure this is necessary. For apps, surely anything they want to do with accent color is CSS related right? And the greeter can read from dbus directly

[cassidyjames]

@danrabbit I am not sure how we plan for flatpaked apps to get the default accent color (i.e. if they're not overriding it). I guess… this would be handled somehow by the Flatpak Platform setting the right stylesheet? But I have no idea how that works.

But if we tell developers to manually request a stylesheet, it would probably be good to request a stylesheet that matches the user's accent color preference unless the app has branding reasons to set their own accent color.

[Marukesu]

From what I understand, in X11, flatpak use the system xsettings to get the theme, if it don't exist on the platform, Adwaita is used. But You can force a theme with the GTK.Settings Class in the application code.