don't mark vehicle as updated on duplicat packet

Author: rossengeorgiev

js/tracker.js

@@ -1915,7 +1915,10 @@ function addPosition(position) {
     else if(wvar.mode == "Position") { // we don't splice old postions in latest position mode
         return;
     }
-    else if(vehicle.positions_ts.indexOf(new_ts) == -1) { // backlog packets, need to splice them into the array
+    else {
+        if(vehicle.positions_ts.indexOf(new_ts) > -1) return; // duplicate packet
+
+        // backlog packets, need to splice them into the array
         // find out the index at which we should insert the new point
         var xref = vehicle.positions_ts;
         var idx = -1, len = xref.length;