Trailing whitespace is significant when determining the width of a tag

in mdoc(7) .Bl -tag and man(7) .TP, but not in man(7) .IP.
Quirk reported by Jan Stary <hans at stare dot cz> on ports@.

1 files changed, 6 insertions, 0 deletions

diff --git a/term.c b/term.c
index acda12f7..08a6aa3d 100644
--- a/term.c
+++ b/term.c
@@ -78,6 +78,8 @@ term_end(struct termp *p)
  *    the next column.  However, if less than p->trailspace blanks,
  *    which can be 0, 1, or 2, remain to the right margin, the line
  *    will be broken.
+ *  - TERMP_BRTRSP: Consider trailing whitespace significant
+ *    when deciding whether the chunk fits or not.
  *  - TERMP_BRIND: If the chunk does not fit and the output line has
  *    to be broken, start the next line at the right margin instead
  *    of at the offset.  Used together with TERMP_NOBREAK for the tags
@@ -291,6 +293,10 @@ term_flushln(struct termp *p)
 	} else if (TERMP_DANGLE & p->flags)
 		return;
 
+	/* Trailing whitespace is significant in some columns. */
+	if (vis && vbl && (TERMP_BRTRSP & p->flags))
+		vis += vbl;
+
 	/* If the column was overrun, break the line. */
 	if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) {
 		(*p->endline)(p);