clear state kept outside of print (to be fixed) on re-slice

src/kiri/print.js

@@ -30,6 +30,10 @@
     KIRI.Print = Print;
 
     KIRI.newPrint = function(settings, widgets, id) {
+        lastPoint = null;
+        lastEmit = null;
+        lastOut = null;
+        lastPos = null;
         return new Print(settings, widgets, id);
     };