Single Line Cells Repeating Thead Tfoot Starts Middle Of Page Break After Avoid Expected

crbug.com/656232: The header group should probably repeat on each page here but our current heuristic prevents headers that don't fit at least one content row below them from doing so.

| Col 1 | Col 2 | | Te | xt | | Te | xt | | Te | xt | | Te | xt | | Te | xt | | Te | xt | | Ft 1 | Ft 2 | | Col 1 | Col 2 | | Te | xt | | Te | xt | | Te | xt | | Te | xt | | Te | xt | | Ft 1 | Ft 2 |