[TASK] Remove instead of add filter twice

lib/datadistributor.js

@@ -54,11 +54,22 @@ define(['filters/nodefilter'], function (NodeFilter) {
     }
 
     function addFilter(d) {
+      var newItem = true;
+
+      filters.forEach(function (f) {
+        if (f.getKey && f.getKey() === d.getKey()) {
+          removeFilter(f);
+          newItem = false;
+        }
+      });
+
+      if (newItem) {
         filters.push(d);
         notifyObservers();
         d.setRefresh(refresh);
         refresh();
       }
+    }
 
     function removeFilter(d) {
       filters = filters.filter(function (e) {

lib/filters/genericnode.js

@@ -49,10 +49,15 @@ define(['helper'], function (helper) {
       };
     }
 
+    function getKey() {
+      return value.concat(name);
+    }
+
     return {
       run: run,
       setRefresh: setRefresh,
-      render: render
+      render: render,
+      getKey: getKey
     };
   };
 });