/// Configuration for an ``ApplicationWindow`` scene — collected by modifier methods
/// and applied at attach time.
@_spi(Portico) public struct WindowConfig {
    /// The default window size in pixels, or `nil` for GTK's default.
    @_spi(Portico) public var defaultSize: (width: Int32, height: Int32)? = nil

    /// The window title, or `nil` for no title.
    @_spi(Portico) public var title: String? = nil

    /// Whether the window can be resized by the user, or `nil` for GTK's default.
    @_spi(Portico) public var resizable: Bool? = nil

    /// Whether the window should start in fullscreen mode.
    @_spi(Portico) public var fullscreen: Bool = false

    /// Creates an empty configuration with all defaults.
    @_spi(Portico) public init() {}
}