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ren: reset no-space mode after vertical movements due to .ne

Reported by Carsten Kunze <carsten.kunze@arcor.de>.

--- a/ren.c

+++ b/ren.c

@@ -144,6 +144,7 @@

 static void ren_sp(int n, int nodiv)

 {

 	ren_first();

+	n_ns = 0;

 	/* ignore .sp without arguments when reading diversions */

 	if (!n && ren_div && !n_u)

 		return;

@@ -315,9 +316,9 @@

 	sbuf_init(&send);

 	lspc = MAX(1, n_L) * n_v;	/* line space, ignoreing \x */

 	prev_d = n_d;

-	if (els_neg)

-		ren_sp(-els_neg, 1);

 	if (!n_ns || line[0] || els_neg || els_pos) {

+		if (els_neg)

+			ren_sp(-els_neg, 1);

 		ren_sp(0, 0);

 		if (line[0] && n_nm && body)

 			ren_lnum(&sbeg);

@@ -326,11 +327,11 @@

 			ren_mc(&send, w, ljust);

 		ren_out(sbuf_buf(&sbeg), line, sbuf_buf(&send));

 		n_ns = 0;

+		if (els_pos)

+			ren_sp(els_pos, 1);

 	}

 	sbuf_done(&sbeg);

 	sbuf_done(&send);

-	if (els_pos)

-		ren_sp(els_pos, 1);

 	n_a = els_pos;

 	if (detect_traps(prev_d, n_d) || detect_pagelimit(lspc - n_v)) {

 		if (!ren_pagelimit(lspc - n_v))