Merge pull request #12447 from AUTOMATIC1111/extra-networks-metadata-indent-

save extra networks metadata with indent 

modules/ui_extra_networks_user_metadata.py

@@ -125,7 +125,7 @@ class UserMetadataEditor:
         basename, ext = os.path.splitext(filename)
 
         with open(basename + '.json', "w", encoding="utf8") as file:
-            json.dump(metadata, file)
+            json.dump(metadata, file, indent=4)
 
     def save_user_metadata(self, name, desc, notes):
         user_metadata = self.get_user_metadata(name)