Allow &mut self in overlay

native/src/widget/tooltip.rs

@@ -221,12 +221,12 @@ where
     }
 
     fn overlay<'b>(
-        &'b self,
+        &'b mut self,
         tree: &'b mut Tree,
         layout: Layout<'_>,
         renderer: &Renderer,
     ) -> Option<overlay::Element<'b, Message, Renderer>> {
-        self.content.as_widget().overlay(
+        self.content.as_widget_mut().overlay(
             &mut tree.children[0],
             layout,
             renderer,