Add scoped overlay hosts

core/src/widget/like.rs

@@ -22,14 +22,14 @@ pub trait WidgetLike<Rsc: UiRsc, Tag>: Sized {
         }
     }
 
-    fn set_root(self, rsc: &mut Rsc, root: &mut impl HasRoot) {
+    fn set_root(self, rsc: &mut Rsc, root: &mut impl HasRoot<Rsc>) {
         let id = self.add_strong(rsc);
-        root.set_root(id);
+        root.set_root(rsc, id);
     }
 }
 
-pub trait HasRoot {
-    fn set_root(&mut self, root: StrongWidget);
+pub trait HasRoot<Rsc> {
+    fn set_root(&mut self, rsc: &mut Rsc, root: StrongWidget);
 }
 
 pub trait WidgetArrLike<Rsc, const LEN: usize, Tag> {