Resolve some input focus issues for the debugger.

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

 // Copyright (c) 2014, 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.
 
 library debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/cli.dart';
@@ skipping 1466 matching lines @@
         app.vm.listenEventStream(VM.kStderrStream, debugger.onStderr);
     _logSubscriptionFuture =
         app.vm.listenEventStream(Isolate.kLoggingStream, debugger.onEvent);
     // Turn on the periodic poll timer for this page.
     pollPeriod = const Duration(milliseconds:100);
 
     onClick.listen((event) {
       // Random clicks should focus on the text box.  If the user selects
       // a range, don't interfere.
       var selection = window.getSelection();
-      if (selection == null || selection.type == 'Caret') {
+      if (selection == null ||
+          (selection.type != 'Range' && selection.type != 'text')) {
         debugger.input.focus();
       }
     });
   }
 
   void onPoll() {
     debugger.flushStdio();
   }
 
   @override
@@ skipping 508 matching lines @@
         }
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }