Introduce opaque widget helper

core/src/mouse/interaction.rs

@@ -3,6 +3,7 @@
 #[allow(missing_docs)]
 pub enum Interaction {
     #[default]
+    None,
     Idle,
     Pointer,
     Grab,

core/src/overlay.rs

@@ -79,7 +79,7 @@ where
         _viewport: &Rectangle,
         _renderer: &Renderer,
     ) -> mouse::Interaction {
-        mouse::Interaction::Idle
+        mouse::Interaction::None
     }
 
     /// Returns true if the cursor is over the [`Overlay`].

core/src/widget.rs

@@ -137,7 +137,7 @@ where
         _viewport: &Rectangle,
         _renderer: &Renderer,
     ) -> mouse::Interaction {
-        mouse::Interaction::Idle
+        mouse::Interaction::None
     }
 
     /// Returns the overlay of the [`Widget`], if there is any.