Move aggrid temporarily to read data despite unmountedv (client-side)

Author: evnchn

nicegui/elements/aggrid/aggrid.py

@@ -245,6 +245,13 @@ async def get_client_data(
         }
         result = await self.client.run_javascript(f'''
             const rowData = [];
+            if (getElement({self.id}) === undefined) {{
+                mounted_app.elements[{self.client.content.id}].children.push({self.id});
+                mounted_app.elements[{next(self.ancestors()).id}].children.pop({self.id});
+                await mounted_app.$nextTick();
+                mounted_app.elements[{self.client.content.id}].children.pop({self.id});
+                mounted_app.elements[{next(self.ancestors()).id}].children.push({self.id});
+            }}
             getElement({self.id}).api.{API_METHODS[method]}(node => rowData.push(node.data));
             return rowData;
         ''', timeout=timeout)