reusing an existing search name doesn't cause any error. It could probably say " search already exist" . it just overwrites which is incorrect and there is no way to recover the older search. This is destructive way of handling.

4.20

always 

1.have an advance search created with fedora and then create another with fedora and it just works 
2.
3.

overwrites existing search if already name already exist 

should not overwrite and says search exists