infinity-loop when include `@FocusState`

[sahara-ooga]

Inputing an object containing @FocusState will cause an infinite loop.

A temporary fix to not output anything in FocusState object has been included in #182, but no fundamental fix has been made yet.

[sahara-ooga]

@YusukeHosonuma
Can you provide a simple code sample to reproduce the event?

[YusukeHosonuma]

As follows.

import SwiftUI
import SwiftPrettyPrint

enum FocusableField: Hashable {
    case email
    case password
}

struct ContentView: View {
    @FocusState private var focus: FocusableField?

    var body: some View {
        TextField("email", text: .constant(""))
            .focused($focus, equals: .email)
            .onChange(of: focus) { _ in
                Pretty.prettyPrintDebug(self) // ⚠️ Occur infinity-loop when focus to `email` TextField.
            }
    }
}