Get the field which called Editor.checkValid event(or the one which has just been modified)

Dear Anki Community,

Thank you very much for the project.

May anyone suggest a way to get the field which called Editor.checkValid event during note addition or modification?

Please, correct me, if mistaken: the self of Editor.checkValid contains the whole Editor object, not a field.

The main reason is to retrieve the data(i.e. name, value) of a field which has just been actually modified each alter.

Best and kind regards