fix: Handle new file creation in the same folder

tests/basic/test_editblock.py

@@ -456,6 +456,43 @@ Hope you like it!
             ],
         )
 
+    def test_new_file_created_in_same_folder(self):
+        edit = """
+Here's the change:
+
+path/to/a/file2.txt
+```python
+<<<<<<< SEARCH
+=======
+three
+>>>>>>> REPLACE
+```
+
+another change
+
+path/to/a/file1.txt
+```python
+<<<<<<< SEARCH
+one
+=======
+two
+>>>>>>> REPLACE
+```
+
+Hope you like it!
+"""
+
+        edits = list(
+            eb.find_original_update_blocks(edit, valid_fnames=["path/to/a/file1.txt"])
+        )
+        self.assertEqual(
+            edits,
+            [
+                ("path/to/a/file2.txt", "", "three\n"),
+                ("path/to/a/file1.txt", "one\n", "two\n"),
+            ],
+        )
+
 
 if __name__ == "__main__":
     unittest.main()