Remove now redundant Overlay::is_over

The `mouse_interaction` method can be properly used
now to encode hover status with the `None` and `Idle`
variants.

widget/src/pick_list.rs

@@ -690,7 +690,7 @@ where
         tree: &'b mut Tree,
         layout: Layout<'_>,
         renderer: &Renderer,
-        _viewport: &Rectangle,
+        viewport: &Rectangle,
         translation: Vector,
     ) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
         let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
@@ -722,7 +722,11 @@ where
                 menu = menu.text_size(text_size);
             }
 
-            Some(menu.overlay(layout.position() + translation, bounds.height))
+            Some(menu.overlay(
+                layout.position() + translation,
+                *viewport,
+                bounds.height,
+            ))
         } else {
             None
         }