Preview group 🔥

It is convenient way to create multiple previews inside one struct

Limitations:

• only 10 previews inside group
• rtl and language properties can be set only to group, not to previews directly

#if canImport(SwiftUI)
import SwiftUI
@available(iOS 13.0, *)
struct MyPreviewGroup_Preview: PreviewProvider, DeclarativePreviewGroup {
    static var previewGroup: PreviewGroup {
        PreviewGroup { // 1 to 10 previews inside
            Preview {
                MainViewController()
            }
            .colorScheme(.dark)
            .device(.iPhoneX)
            Preview {
                MainViewController()
            }
            .colorScheme(.light)
            .device(.iPhoneX)
            Preview {
                // in this group title will be shown in `fr` language
                UButton(String(.en("Hello"), .fr("Bonjour"), .ru("Привет")))
                    .circle()
                    .background(.blackHole / .white)
                    .color(.white / .black)
                    .height(54)
                    .edgesToSuperview(h: 8)
                    .centerYInSuperview()
            }
            .colorScheme(.dark)
            .layout(.fixed(width: 300, height: 64))
        }
        .language(.fr) // limited to group
        .rtl(true) // limited to group
    }
}
#endif