Introduce opaque widget helper

winit/src/conversion.rs

@@ -396,7 +396,9 @@ pub fn mouse_interaction(
     use mouse::Interaction;
 
     match interaction {
-        Interaction::Idle => winit::window::CursorIcon::Default,
+        Interaction::None | Interaction::Idle => {
+            winit::window::CursorIcon::Default
+        }
         Interaction::Pointer => winit::window::CursorIcon::Pointer,
         Interaction::Working => winit::window::CursorIcon::Progress,
         Interaction::Grab => winit::window::CursorIcon::Grab,

winit/src/multi_window/window_manager.rs

@@ -60,7 +60,7 @@ where
                 exit_on_close_request,
                 surface,
                 renderer,
-                mouse_interaction: mouse::Interaction::Idle,
+                mouse_interaction: mouse::Interaction::None,
             },
         );