Fires when a party/raid member's role is changed manually. Roles are the strings "TANK", "HEALER", "DAMAGER", and "NONE". Use the additional arguments if you want to immediately use the new status; a call to UnitGroupRolesAssigned may not report the new data when called at this time.
changedPlayer- The name of the player whose role was changed (
changedBy- The name of player who made the change (
oldRole- Their role before the change (
newRole- Their new role (