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[bug #63449] [tbl] causes grotty to complain "character above first line

From: G. Branden Robinson
Subject: [bug #63449] [tbl] causes grotty to complain "character above first line discarded"
Date: Thu, 1 Dec 2022 03:19:45 -0500 (EST)

Follow-up Comment #1, bug #63449 (project groff):

[comment #0 original submission:]
> If a non-boxed tbl(1) table has at least one vertical rule in it and the
table starts at the top of the page (i.e., there is no top margin, and the
current drawing position when the page begins is 1v), then this warning will
happen because when formatting for troff, vertical rules are drawn 1v _above_
the top of the page.  This is so that intersections with horizontal rules can
be detected by grotty and replaced with appropriate intersection characters. 
(Except on the 'utf8' output device, this is always a plus sign.)

The vertical rule has to be present on the first table row.


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