In GNU, Heirloom, and Plan 9 roff, tab positions apply to *input* lines,

not to *output* lines.  In particular, if an input line gets broken in
fill mode and a tab occurs in the second output line, it advances to a
position of at least (width of the first output line) + (width of a
space character even though this is never printed) + (width of the part
of the second output line that precedes the tab).

Implement the same logic in mandoc.

Again, do not use tabs in filled text: they have surprising effects,
including this one.

1 files changed, 1 insertions, 0 deletions

diff --git a/term.h b/term.h
index 4de3517d..721f0ccc 100644
--- a/term.h
+++ b/term.h
@@ -56,6 +56,7 @@ struct	termp_col {
 	size_t		  col;		/* Byte in buf to be written. */
 	size_t		  rmargin;	/* Current right margin. */
 	size_t		  offset;	/* Current left margin. */
+	size_t		  taboff;	/* Offset for literal tabs. */
 };
 
 struct	termp {