The barcode mechanism is supposed to handle commands PAGER-FIRST (go to first record referenced in the pager) and PAGER-LAST (go to last record). Before this rev., it wasn't the case. We needed to add an option 'notifyChange' to the updateState function of the pager, to ensure that the form is correctly reloaded when the pager cursor is manually set (by the barcode handler) on the first or last element.