Fix overlay flickering after Application::update

native/src/user_interface.rs

@@ -345,13 +345,28 @@ where
 
         let viewport = Rectangle::with_size(self.bounds);
 
-        if let Some(layout) = &self.overlay {
+        let base_cursor = if let Some(overlay) =
-            let base_cursor = if layout.bounds().contains(cursor_position) {
+            self.root.overlay(Layout::new(&self.base), renderer)
+        {
+            let overlay_layout = self
+                .overlay
+                .take()
+                .unwrap_or_else(|| overlay.layout(renderer, self.bounds));
+
+            let new_cursor_position =
+                if overlay_layout.bounds().contains(cursor_position) {
                     Point::new(-1.0, -1.0)
                 } else {
                     cursor_position
                 };
 
+            self.overlay = Some(overlay_layout);
+
+            new_cursor_position
+        } else {
+            cursor_position
+        };
+
         self.root.widget.draw(
             renderer,
             &renderer::Style::default(),
@@ -359,15 +374,6 @@ where
             base_cursor,
             &viewport,
         );
-        } else {
-            self.root.widget.draw(
-                renderer,
-                &renderer::Style::default(),
-                Layout::new(&self.base),
-                cursor_position,
-                &viewport,
-            );
-        };
 
         let base_interaction = self.root.widget.mouse_interaction(
             Layout::new(&self.base),