align the closed button to right (#193)

Co-authored-by: CHANGAN SHI <>

Author: changanxian

lib/samples/edit_feature_attachments/edit_feature_attachments.dart

@@ -173,19 +173,18 @@ class _AttachmentsOptionsState extends State<AttachmentsOptions>
                       color: Colors.white,
                     ),
                   ),
-                  IconButton(
-                    icon: const Icon(Icons.close),
-                    onPressed: () => Navigator.pop(context),
-                  ),
-                  Visibility(
-                    visible: isLoading,
-                    child: const SizedBox(
+                 isLoading 
+                 ? const SizedBox(
                       height: 18,
                       width: 18,
                       child: CircularProgressIndicator(
                         color: Colors.white,
                       ),
-                    ),
+                    )
+                  : const SizedBox.shrink(),
+                  IconButton(
+                    icon: const Icon(Icons.close),
+                    onPressed: () => Navigator.pop(context),
                   ),
                 ],
               ),