Extract Graph#modifications

js/iD/graph/Graph.js

@@ -84,5 +84,11 @@ iD.Graph.prototype = {
         }
         entity.nodes = nodes;
         return entity;
+    },
+
+    modifications: function() {
+        _.filter(this.entities, function(entity) {
+            return entity.modified;
+        });
     }
 };

js/iD/renderer/Map.js

@@ -535,9 +535,7 @@ iD.Map = function(elem, connection) {
     }
 
     function commit() {
-        connection.createChangeset(_.filter(history.graph().entities, function(e) {
-            return e.modified;
-        }));
+        connection.createChangeset(history.graph().modifications());
     }
 
     map.handleDrag = handleDrag;