iced_core/window/level.rs
/// A window level groups windows with respect to their z-position.
///
/// The relative ordering between windows in different window levels is fixed.
/// The z-order of a window within the same window level may change dynamically
/// on user interaction.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum Level {
/// The default behavior.
#[default]
Normal,
/// The window will always be below normal windows.
///
/// This is useful for a widget-based app.
AlwaysOnBottom,
/// The window will always be on top of normal windows.
AlwaysOnTop,
}