[Effen] Only skip rows we're showing, when skipping past the rows that we've scrolled beyond in the…

sky/examples/stocks/lib/stock_list.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'package:sky/framework/animation/scroll_behavior.dart';
 import 'package:sky/framework/components/fixed_height_scrollable.dart';
 import 'package:sky/framework/fn.dart';
 import 'stock_data.dart';
 import 'stock_row.dart';
 
 class Stocklist extends FixedHeightScrollable {
   String query;
   List<Stock> stocks;
 
   Stocklist({
     Object key,
     this.stocks,
     this.query
   }) : super(key: key, scrollBehavior: new OverscrollBehavior());
 
   List<UINode> buildItems(int start, int count) {
     return stocks
-      .skip(start)
       .where((stock) => query == null || stock.symbol.contains(
           new RegExp(query, caseSensitive: false)))
+      .skip(start)
       .take(count)
       .map((stock) => new StockRow(stock: stock))
       .toList(growable: false);
   }
 }