[bug #43636] tbl: double horizontal rule in nroff

[Bjarni Ingi Gislason]

Follow-up Comment #1, bug #43636 (project groff):

  If a double line is asked for in the output of "nroff", two lines
with an underscore are needed in the source.

  "troff" puts these two lines at the same two vertical positions as if
'=' were used.

  "troff" produces two lines for the '=' data entry.
It depends on the resolution of the output device (option -T)
whether the two lines get the same vertical position or not.

  This is material for tbl(1).


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