When making scope, always have calling session be the parent

Author: schloerke

shiny/session/_session.py

@@ -1233,8 +1233,9 @@ def is_stub_session(self) -> bool:
     async def close(self, code: int = 1001) -> None:
         await self._parent.close(code)
 
-    def make_scope(self, id: str) -> Session:
-        return self._parent.make_scope(self.ns(id))
+    def make_scope(self, id: Id) -> Session:
+        ns = self.ns(id)
+        return SessionProxy(parent=self, ns=ns)
 
     def root_scope(self) -> Session:
         res = self