Columns you can actually move, and taxes you pick rather than type

The headings on a document’s item table sat inside the machinery that sorts them and never registered as one of its items, so there was nothing to take hold of, no grip to take hold of it by, and the drop never fired. The sensor, the reorder and the saving were all there, waiting on a component that never joined in.

Each heading is a sortable item now, with a grip that appears when you hover it. Only the grip starts a drag: dragging from anywhere on the heading would mean a mis-aimed resize moves the column instead. The arrangement is remembered, as the widths already were.

It was a blank name box and a number box. Somebody retyped a rate that was already defined in Settings → Taxes, “Cess” went in on one line and “cess” on the next, and a line could carry 4.5% of something no report would ever group.

Further taxes come from the same list the main rate does, and appear as chips the way tags do: one click to add, one to take off. A tax already on the line is not offered again, and neither is the one the line already carries as its main rate.

What is stored is still the name and the rate as they stood rather than a pointer to the rate. An invoice has to go on saying what was actually charged after somebody edits that rate in settings next year.