Add a new example and change how embedding is stored

crates/eframe/src/epi/mod.rs

@@ -214,7 +214,7 @@ pub trait App {
         // NOTE: a bright gray makes the shadows of the windows look weird.
         // We use a bit of transparency so that if the user switches on the
         // `transparent()` option they get immediate results.
-        egui::Color32::from_rgba_unmultiplied(12, 12, 12, 180).to_normalized_gamma_f32()
+        egui::Color32::from_rgba_unmultiplied(12, 12, 12, 0).to_normalized_gamma_f32()
 
         // _visuals.window_fill() would also be a natural choice
     }

crates/eframe/src/native/epi_integration.rs

@@ -517,11 +517,7 @@ impl EpiIntegration {
         // Run user code:
         let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
             crate::profile_scope!("App::update");
-            if let Some(render) = render {
-                (render.as_ref())(egui_ctx, viewport_id, parent_id)
-            } else {
-                app.update(egui_ctx, &mut self.frame, render.as_ref().map(|r| &***r));
-            }
+            app.update(egui_ctx, &mut self.frame, render.as_ref().map(|r| &***r));
         });
 
         self.pending_full_output.append(full_output);

crates/eframe/src/native/run.rs

@@ -1065,7 +1065,12 @@ mod glow_integration {
                         let screen_size_in_pixels: [u32; 2] =
                             win.window.as_ref().unwrap().inner_size().into();
 
-                        egui_glow::painter::clear(&gl, screen_size_in_pixels, [0.0, 0.0, 0.0, 0.0]);
+                        win.window.as_mut().unwrap().set_transparent(true);
+                        egui_glow::painter::clear(
+                            &gl,
+                            screen_size_in_pixels,
+                            app.clear_color(&integration.egui_ctx.style().visuals),
+                        );
 
                         integration.egui_ctx.set_current_viewport_id(win.window_id);
                         egui::FullOutput {

crates/egui/src/containers/window.rs

@@ -175,7 +175,6 @@ pub struct Window<'open> {
     collapsible: bool,
     default_open: bool,
     with_title_bar: bool,
-    embedded: bool,
     window_builder: ViewportBuilder,
 }
 
@@ -200,7 +199,6 @@ impl<'open> Window<'open> {
             collapsible: true,
             default_open: true,
             with_title_bar: true,
-            embedded: false,
         }
     }
 
@@ -415,11 +413,6 @@ impl<'open> Window<'open> {
         self.area = self.area.drag_bounds(bounds);
         self
     }
-
-    pub fn embedded(mut self, value: bool) -> Self {
-        self.embedded = value;
-        self
-    }
 }
 
 impl<'open> Window<'open> {
@@ -449,10 +442,12 @@ impl<'open> Window<'open> {
             collapsible,
             default_open,
             with_title_bar,
-            embedded,
             mut window_builder,
         } = self;
 
+        let embedded =
+            ctx.data_mut(|data| *data.get_persisted_mut_or(area.id.with("_embedded"), false));
+
         let is_open = if let Some(open) = &mut open {
             if let Some(tmp_open) = ctx.data_mut(|data| {
                 let tmp = data.get_persisted::<bool>(area.id.with("_open"));