Short headers silently drop columns from ragged tables #494

On current master (268615a5), adding a header silently hides columns that occur after a short first data row:

from tabulate import tabulate
print(tabulate([["a"], ["b", "KEEP"]], headers=["tail"]))

KEEP is missing; without headers it is retained. This also affects headers="firstrow" and column-index headers. No maxcolwidths is needed, so #482 leaves this case unchanged.

I have a fix with 28 regression/control cases. The configured suites pass on Python 3.11 and 3.14. Would you be willing to pay $50 for the tested fix, regression tests, and documentation update?

Dima Mak / ub3dqy