message: Document that `window::Action::Move` is unsupported on Wayland
  notes that this isn't supported on Wayland.
  Wayland by design doesn't allow applications to position windows
  arbitrarily. GTK4 in comparison removed `gtk_window_move()` (which
  naturally didn't work on Wayland).
diff: @@ -13,6 +13,8 @@ pub enum Action<T> {
  height: u32,
  },
  /// Move the window.
  + ///
  + /// Unsupported on Wayland.
  Move {
  /// The new logical x location of the window
  x: i32,
  