Right, but can they change the rules without a quorum? I would not like to see the WI legislature simply make up rules every day to accommodate their daily needs. Would you?
No.
Organization of legislature; quorum; compulsory attendance. SECTION 7. Each house shall be the judge of the elections, returns and qualifications of its own members; and a majority of each shall constitute a quorum to do business, but a smaller number may adjourn from day to day, and may compel the attendance of absent members in such manner and under such penalties as each house may provide.
They had a quorum to do business.