dead code and minor warning removal

lib/email.dart

@@ -48,6 +48,7 @@ class EmailListScreen extends StatelessWidget {
   }
 }
 
+// ignore: must_be_immutable
 class EmailPage extends StatefulWidget {
   EmailPage({Key? key}) : super(key: key);
   String selectedFolder = "INBOX";

lib/home_page.dart

@@ -163,34 +163,32 @@ class _HomeScreenState extends State<HomeScreen> {
     );
   }
 
-  void _showPopupMenu(BuildContext context, Offset position) async {
+//   void _showPopupMenu(BuildContext context, Offset position) async {
-    final RenderBox overlay =
+//     final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+//         Overlay.of(context).context.findRenderObject() as RenderBox;
 
-    await showMenu<String>(
+//     await showMenu<String>(
-      context: context,
+//       context: context,
-      position: RelativeRect.fromLTRB(
+//       position: RelativeRect.fromLTRB(
-        position.dx,
+//         position.dx,
-        position.dy,
+//         position.dy,
-        overlay.size.width - position.dx,
+//         overlay.size.width - position.dx,
-        overlay.size.height - position.dy,
+//         overlay.size.height - position.dy,
-      ),
+//       ),
-      items: <PopupMenuEntry<String>>[
+//       items: <PopupMenuEntry<String>>[
-        PopupMenuItem<String>(
+//         PopupMenuItem<String>(
-          value: 'Open',
+//           value: 'Open',
-          child: Text('Open'),
+//           child: Text('Open'),
-        ),
+//         ),
-        PopupMenuItem<String>(
+//         PopupMenuItem<String>(
-          value: 'Reply',
+//           value: 'Reply',
-          child: Text('Reply'),
+//           child: Text('Reply'),
-        ),
+//         ),
-        PopupMenuItem<String>(
+//         PopupMenuItem<String>(
-          value: 'Delete',
+//           value: 'Delete',
-          child: Text('Delete'),
+//           child: Text('Delete'),
-        ),
+//         ),
-      ],
+//       ],
-    );
+//     );
-  }
+//   }
-}
+// }
-
-//show popup menu