fresh regression - regproc result contains unwanted schema

Hi

when I fixed old bug of plpgsql_check I found new regression of regproc
output.

set check_function_bodies TO off;

postgres=# create or replace function f1() returns int as $$ begin end $$
language plpgsql;
CREATE FUNCTION
postgres=# select 'f1()'::regprocedure::oid::regproc;
regproc
---------
f1
(1 row)

postgres=# create or replace function f1(int) returns int as $$ begin end
$$ language plpgsql;
CREATE FUNCTION
postgres=# select 'f1()'::regprocedure::oid::regproc;
regproc
-----------
public.f1
(1 row)

When function is overwritten, then regproc result contains schema, although
it is on search_path

This behave breaks regress tests (and it is not consistent)

Tested on master

Regards

Pavel