Nest the deleting batch in the regression test

crates/engine/src/tests.rs

@@ -544,7 +544,13 @@ fn saving_after_a_batch_that_deletes_pages_rewrites_the_file() {
     let original = s.save_bytes(id).unwrap();
     let batch = Edit::Batch {
         label: "Delete and rotate".into(),
-        edits: vec![Edit::DeletePages { pages: vec![1, 2, 3, 4] }, Edit::RotatePages { pages: vec![0], degrees: 90 }],
+        edits: vec![
+            Edit::Batch {
+                label: "Delete pages".into(),
+                edits: vec![Edit::DeletePages { pages: vec![1, 2, 3, 4] }],
+            },
+            Edit::RotatePages { pages: vec![0], degrees: 90 },
+        ],
     };
     s.apply(id, batch).unwrap();
     let saved = s.save_bytes(id).unwrap();