QTable: columns: calculated bottom-row

[florian-senn]

I'd like to suggest a new optional field for columns definition which adds a (bottom-row?) cell with the possibility to display a calculated value depending on visible rows.

Example:

const columns: QTableColumn[] = [
   {
        name: 'total',
        align: 'center',
        label: 'total',
        field: 'total',
        sortable: true,
        format: (val: any) => Number(val).toFixed(2),
        sort: (a, b) => a - b,
        calc: column.reduce((a,b) => a + b, 0),
    },
]