When drawing a horizontal line in tbl(7) UTF-8 output, it is not

sufficient to look at two data rows, but up to three are needed:
the one above to identify vertical lines branching off upward, the
row itself (in case the line is in a data row rather than a layout
line) to figure out the horizontal line style, and the row below
to identify vertical lines branching off downward.

As an example, bentley@ reported from the mpv(1) manual page that
in a tbl(7) having a vertical line in the middle and a horizontal
line in the bottom data row, the vertical line extended below the
bottom horizontal line.

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