Make Text size to its content instead of always 100% width

sky/sdk/lib/framework/rendering/paragraph.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:sky' as sky;
 import 'box.dart';
 import 'object.dart';
 
 class RenderInline extends RenderObject {
   String data;
@@ skipping 34 matching lines @@
     return null;
     // we don't currently support this for RenderParagraph
   }
 
   void performLayout() {
     _layoutRoot.maxWidth = constraints.maxWidth;
     _layoutRoot.minWidth = constraints.minWidth;
     _layoutRoot.minHeight = constraints.minHeight;
     _layoutRoot.maxHeight = constraints.maxHeight;
     _layoutRoot.layout();
-    size = constraints.constrain(new Size(_layoutRoot.rootElement.width, _layoutRoot.rootElement.height));
+    // rootElement.width always expands to fill, use maxContentWidth instead.
+    var root = _layoutRoot.rootElement;
+    size = constraints.constrain(new Size(root.maxContentWidth, root.height));
   }
 
   void paint(RenderObjectDisplayList canvas) {
     // _layoutRoot.rootElement.style['color'] = 'rgba(' + ...color... + ')';
     _layoutRoot.paint(canvas);
   }
 
   // we should probably expose a way to do precise (inter-glpyh) hit testing
 
   String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}color: ${color}\n${prefix}text: ${text}\n';
 }