Patch that addresses the saving of the sort priority in 3.1.x is available here: collab/gmcharlt/lp1790169_eggrid_column_sort_wip. The branch remains WIP since the sort settings are not honored.
Patch that addresses the saving of the sort priority in 3.1.x is available here: collab/ gmcharlt/ lp1790169_ eggrid_ column_ sort_wip. The branch remains WIP since the sort settings are not honored.