- "--clusters" output is quite advanced, but still dot makes a bit of a

mess out of it. One of the reasons is that the intruder events
  cannot be used along with the normal ranking, because they no longer
  correspond to real events.

src/depend.c

@@ -562,7 +562,6 @@ iteratePrecedingEvents (const System sys, int (*func) (int run, int ev),
 		{
 		  return false;
 		}
-	      break;
 	    }
 	}
     }