Position the popup menu in stocks2 correctly

sky/sdk/lib/framework/rendering/box.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 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:typed_data';
 import 'object.dart';
 import 'package:vector_math/vector_math.dart';
 import 'package:sky/framework/net/image_cache.dart' as image_cache;
@@ skipping 68 matching lines @@
 
   BoxConstraints apply(BoxConstraints constraints) {
     return new BoxConstraints(
       minWidth: math.max(minWidth, constraints.minWidth),
       maxWidth: math.min(maxWidth, constraints.maxWidth),
       minHeight: math.max(minHeight, constraints.minHeight),
       maxHeight: math.min(maxHeight, constraints.maxHeight));
   }
 
   BoxConstraints applyWidth(double width) {
-    return new BoxConstraints(minWidth: width,
-                              maxWidth: width,
+    return new BoxConstraints(minWidth: math.max(minWidth, width),
+                              maxWidth: math.min(maxWidth, width),
                               minHeight: minHeight,
                               maxHeight: maxHeight);
   }
+
+  BoxConstraints applyMinWidth(double width) {
+    return new BoxConstraints(minWidth: math.max(minWidth, width),
+                              maxWidth: maxWidth,
+                              minHeight: minHeight,
+                              maxHeight: maxHeight);
+  }
+
+  BoxConstraints applyMaxWidth(double width) {
+    return new BoxConstraints(minWidth: minWidth,
+                              maxWidth: math.min(maxWidth, width),
+                              minHeight: minHeight,
+                              maxHeight: maxHeight);
+  }
 
   BoxConstraints applyHeight(double height) {
     return new BoxConstraints(minWidth: minWidth,
                               maxWidth: maxWidth,
-                              minHeight: height,
-                              maxHeight: height);
+                              minHeight: math.max(minHeight, height),
+                              maxHeight: math.min(maxHeight, height));
+  }
+
+  BoxConstraints applyMinHeight(double height) {
+    return new BoxConstraints(minWidth: minWidth,
+                              maxWidth: maxWidth,
+                              minHeight: math.max(minHeight, height),
+                              maxHeight: maxHeight);
+  }
+
+  BoxConstraints applyMaxHeight(double height) {
+    return new BoxConstraints(minWidth: minWidth,
+                              maxWidth: maxWidth,
+                              minHeight: minHeight,
+                              maxHeight: math.min(maxHeight, height));
   }
 
   final double minWidth;
   final double maxWidth;
   final double minHeight;
   final double maxHeight;
 
   double constrainWidth(double width) {
     return clamp(min: minWidth, max: maxWidth, value: width);
   }
@@ skipping 875 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }