Hello *, is there a way/what's the cleaner way to support multiple sort columns with DataTable? I know it's up to the SortableDataProvider to provide sorted rows, no matter how, but the SortParam class seems to support only one sort criterium at a time. e.g. the DataTable is aware only of the *last* sorted column. Even if I kept track of other columns (e.g. previously clicked for sorting), I still have no clue about how to provide a visual feedback to the user about what columns are being included in the sort criteria.
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