Comment 8 for bug 1097760

thanks Korrawit for finding that!

i realize now that my fix is totally wrong, because i
misunderstood how covered cells are represented in writer tables:

there is only a dummy TableBox with negative span for
vertically merged cells, but not for horizontally merged cells,
so it is valid for a table to have different number
of TableBoxes in eaach row.

need to think of a different solution for the original
problem that some part of the table was apparently not
covered by a cell...