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height computation: fix order of operations.

--- a/mbox.c

+++ b/mbox.c

@@ -669,7 +669,9 @@

 		/* Bump whole thread up in list */

 		if(r->nsub > 0){

 			ln = mesglineno(r, nil);

-			nr = r->nsub + (r->state & Sdummy) ? 0 : 1;

+			nr = r->nsub;

+			if(!(r->state & Sdummy))

+				nr++;

 			assert(nr > 0);

 			fprint(mbox.addr, "%d,%d", ln, ln+nr-1);

 			write(mbox.data, "", 0);