Introduce internal overlay::Nested for UserInterface

core/src/overlay/group.rs

@@ -147,11 +147,18 @@ where
         });
     }
 
-    fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
+    fn is_over(
+        &self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        cursor_position: Point,
+    ) -> bool {
         self.children
             .iter()
             .zip(layout.children())
-            .any(|(child, layout)| child.is_over(layout, cursor_position))
+            .any(|(child, layout)| {
+                child.is_over(layout, renderer, cursor_position)
+            })
     }
 }