[groff] 18/31: tbl(1): Document nroff mode vertical space issue.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 7925122f390decc2cdcc6072645b9e16190587ad
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sun Aug 14 05:59:16 2022 -0500

    tbl(1): Document nroff mode vertical space issue.
    
    For me, at least, this knowledge was hard-won.  :-|
---
 src/preproc/tbl/tbl.1.man | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/preproc/tbl/tbl.1.man b/src/preproc/tbl/tbl.1.man
index 36dc21141..d97e312e1 100644
--- a/src/preproc/tbl/tbl.1.man
+++ b/src/preproc/tbl/tbl.1.man
@@ -1555,6 +1555,21 @@ so the
 .B u
 column modifier has no effect.
 .
+On terminal devices,
+horizontal rules and box borders occupy a full vee of space;
+this amount is doubled for
+.B doublebox
+tables.
+.
+Tables using these features thus require more vertical space in
+.I nroff
+mode than in
+.I troff
+mode:
+write
+.B ne
+requests accordingly.
+.
 .
 .P
 A text block within a table must be able to fit on one page.