TableBorder constructor
Creates a border for a table.
All the sides of the border default to BorderSide.none.
Implementation
const TableBorder({
this.top = BorderSide.none,
this.right = BorderSide.none,
this.bottom = BorderSide.none,
this.left = BorderSide.none,
this.horizontalInside = BorderSide.none,
this.verticalInside = BorderSide.none,
});