feat: allow creating apps with no main window on wayland

src/app/mod.rs

@@ -80,7 +80,10 @@ pub fn run<App: Application>(settings: Settings, flags: App::Flags) -> iced::Res
     {
         use iced::wayland::actions::window::SctkWindowSettings;
         use iced_sctk::settings::InitialSurface;
-        iced.initial_surface = InitialSurface::XdgWindow(SctkWindowSettings {
+        iced.initial_surface = if settings.no_main_window {
+            InitialSurface::None
+        } else {
+            InitialSurface::XdgWindow(SctkWindowSettings {
                 app_id: Some(App::APP_ID.to_owned()),
                 autosize: settings.autosize,
                 client_decorations: settings.client_decorations,
@@ -90,7 +93,8 @@ pub fn run<App: Application>(settings: Settings, flags: App::Flags) -> iced::Res
                 title: None,
                 transparent: settings.transparent,
                 ..SctkWindowSettings::default()
-        });
+            })
+        };
     }
 
     #[cfg(not(feature = "wayland"))]

src/app/settings.rs

@@ -19,6 +19,10 @@ pub struct Settings {
     #[cfg(feature = "wayland")]
     pub(crate) autosize: bool,
 
+    /// Set the application to not create a main window
+    #[cfg(feature = "wayland")]
+    pub(crate) no_main_window: bool,
+
     /// Whether the window should have a border, a title bar, etc. or not.
     pub(crate) client_decorations: bool,
 
@@ -71,6 +75,8 @@ impl Default for Settings {
             antialiasing: true,
             #[cfg(feature = "wayland")]
             autosize: false,
+            #[cfg(feature = "wayland")]
+            no_main_window: false,
             client_decorations: true,
             debug: false,
             default_font: font::FONT,