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acme/Mail: correct message line number for partially hidden threads

--- a/sys/src/cmd/upas/Mail/mbox.c

+++ b/sys/src/cmd/upas/Mail/mbox.c

@@ -159,8 +159,9 @@

 	n = 0;

 	for(i = 0; i < m->nchild; i++){

 		c = m->child[i];

+		n += nsub(c);

 		if(!(c->state & (Sdummy|Shide)))

-			n += nsub(c)+1;

+			n++;

 	}

 	return n;

 }

@@ -183,7 +184,9 @@

 		for(i = 0; i < p->nchild; i++){

 			if(p->child[i] == m)

 				break;

-			o += nsub(p->child[i]) + 1;

+			o += nsub(p->child[i]);

+			if(!(p->state & (Sdummy|Shide)))

+				o++;

 		}

 		if(!(p->state & (Sdummy|Shide))){

 			o++;

-- 

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