formhandler: should support multiple sort
Currently, from the interface, user can select only column to sort on. However Gramex FormHandler supports multiple column sort by Column order.
- Would show two column sort on Name, Continent
- although it doesn't highlight the columns.
- If you try to add or modify existing sort. It get's replaced by single sort.
We would need a way to support muli-column sort, if we also want to support toggle between columns for single sort.