All actions and proceedings pending in the district court of any county at the time the county is transferred from one judicial district to another, whether or not the issues are joined, shall proceed in the district court of the judicial district to which the county is transferred in the same manner as if the actions and proceedings had been commenced in that district, except when an action or proceeding pending in a district court has been tried and taken under advisement by a judge of the court, and is still undecided at the time the county is transferred to a different judicial district, it shall be the duty of the judge who tried the cause to make and render findings and judgment on the cause and to determine all motions in the case in all respects as though the county had not been transferred to a different judicial district.