Better reporting of ambiguous and "not found" commands in Obs debugger.

runtime/observatory/lib/src/elements/sample_buffer_control.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. 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:async';
 import 'dart:html';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/helpers/uris.dart';
@@ skipping 124 matching lines @@
         ..classes = ['statusBox' 'shadow' 'center']
         ..children = [
           new DivElement()
             ..children = [
               new HeadingElement.h1()..text = 'Profiling is disabled',
               new BRElement(),
               new DivElement()
                 ..innerHtml = 'Perhaps the <b>profile</b> '
                     'flag has been disabled for this VM.',
               new BRElement(),
-              new SpanElement()..text = 'See all',
+              new SpanElement()..text = 'See all ',
               new AnchorElement(href: Uris.flags())..text = 'vm flags'
             ]
         ]
     ];
   }
 
   List<Element> _createStatusReport() {
     final fetchT = Utils.formatDurationInSeconds(_progress.fetchingTime);
     final loadT = Utils.formatDurationInSeconds(_progress.loadingTime);
     final sampleCount = _progress.profile.sampleCount;
@@ skipping 92 matching lines @@
     }
     throw new Exception('Unknown tagToString');
   }
 
   SampleBufferControlChangedElement _toEvent(_) {
     return new SampleBufferControlChangedElement(this);
   }
 
   void _triggerModeChange(e) => _onTagChange.add(e);
 }