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Fix another off-by-n rendering error: preserve nsub when replacing dummies.

--- a/mbox.c

+++ b/mbox.c

@@ -343,7 +343,7 @@

 load(char *name, char *digest, int ins)

 {

 	Mesg *m, *p, **c;

-	int nc;

+	int nc, ns;

 	if(strncmp(name, mbox.path, strlen(mbox.path)) == 0)

 		name += strlen(mbox.path);

@@ -356,6 +356,7 @@

 	if((p = lookupid(m->messageid)) != nil){

 		c = p->child;

 		nc = p->nchild;

+		ns = p->nsub;

 		mesgclear(p);

 		memcpy(p, m, sizeof(*p));

 		free(m);

@@ -363,6 +364,7 @@

 		m = p;

 		m->child = c;

 		m->nchild = nc;

+		m->nsub = ns;

 	}else

 		addmesg(m, ins);