Issue #2308589 by Liam Morland: Fixed extra trailing whitespace in source.
Issue #2304047 by Liam Morland: Fixes duplicated submission serial nr (db_transaction).
Issue #2307619 by Liam Morland, DanChadwick: Fixed PHP warning with conditional using Select (or Other) module.
Issue #2307619 by DanChadwick: Fixed regression of conditional/select_or_other during preview
Issue #2304585 by Liam Morland: Fixed preview incrementing serial number.