This migration removes all existing widow and orphan properties that may be defined on any of the report elements. The widow/orphan settings were not working on 3.8 version of Pentaho reporting. This migration also removes all keep-together flags from non-bands, like groups and report objects.
Control elements, like groups, group-body and the master-report object, that have any of the width or height properties defined, have these properties cleared during the migration. The old versions of the reporting system ignored these properties, while newer versions honour those properties.