When advancing the left margin, .RS also needs to reset the right margin

to the default and check that the left does not outgrow the right one.
Otherwise, the (rmargin >= offset) assertion fails in term_flushln().
Bug found and fix tested by kristaps@ with NetBSD slapo-retcode(5).

1 files changed, 2 insertions, 1 deletions

diff --git a/man_term.c b/man_term.c
index 65e95e9e..379a39ab 100644
--- a/man_term.c
+++ b/man_term.c
@@ -826,7 +826,8 @@ pre_RS(DECL_ARGS)
 			sz = (size_t)ival;
 
 	mt->offset += sz;
-	p->offset = mt->offset;
+	p->rmargin = p->maxrmargin;
+	p->offset = mt->offset < p->rmargin ? mt->offset : p->rmargin;
 
 	if (++mt->lmarginsz < MAXMARGINS)
 		mt->lmargincur = mt->lmarginsz;