All ordinances of any city or cities consolidated under the provisions of sections 50-2101 through 50-2114, except those of the one having the greater or greatest population and those not in conflict therewith, shall be deemed repealed and of no further force and effect; provided, however, that such repeal shall not operate to discharge any person from any liability, civil or criminal, then existing, nor to affect any prosecution then pending for any violation of any such ordinances; and all cases then pending in any justices’ court, police court or court of record, except of the one having the greater or greatest population, shall upon such consolidation being effected be deemed ipso facto to be transferred to justices’ court, police court, or court of record, of the greater or greatest population having jurisdiction of proceedings or of other actions, civil or criminal, of the character so transferred; provided, further, that such repeal shall not apply to ordinances under which vested rights have accrued, or to ordinances relating to proceedings for street or other public improvements or to proceedings for opening, extending, widening or straightening streets or other public places or to proceedings for changing the grade thereof, all of which proceedings shall be continued and conducted by and under the authority of the newly consolidated corporation, with the same force and effect as if continued and conducted by and under the authority of the corporation by which they were commenced. Except as hereinbefore provided, all ordinances of the corporation having the greater or greatest population shall, upon the completion of such consolidation, ipso facto have full force and effect in and throughout the newly consolidated corporation.