Re-focus the command box after a stack refresh.

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/app.dart';
@@ skipping 837 matching lines @@
       'Refresh debugging information of various sorts.\n'
       '\n'
       'Syntax: refresh <subcommand>\n';
 }
 
 // Tracks the state for an isolate debugging session.
 class ObservatoryDebugger extends Debugger {
   RootCommand cmd;
   DebuggerPageElement page;
   DebuggerConsoleElement console;
+  DebuggerInputElement input;
   DebuggerStackElement stackElement;
   ServiceMap stack;
   String exceptions = "none";  // Last known setting.
 
   int get currentFrame => _currentFrame;
   void set currentFrame(int value) {
     if (value != null && (value < 0 || value >= stackDepth)) {
       throw new RangeError.range(value, 0, stackDepth);
     }
     _currentFrame = value;
@@ skipping 116 matching lines @@
     return isolate.getStack().then((result) {
       stack = result;
       // TODO(turnidge): Replace only the changed part of the stack to
       // reduce flicker.
       stackElement.updateStack(stack, pauseEvent);
       if (stack['frames'].length > 0) {
         currentFrame = 0;
       } else {
         currentFrame = null;
       }
+      input.focus();
     });
   }
 
   void reportStatus() {
     if (_isolate == null) {
       console.print('No current isolate');
     } else if (_isolate.idle) {
       console.print('Isolate is idle');
     } else if (_isolate.running) {
       console.print("Isolate is running (type 'pause' to interrupt)");
@@ skipping 246 matching lines @@
     int fixedHeight = navbarHeight + splitterHeight + cmdHeight;
     int available = windowHeight - fixedHeight;
     int stackHeight = available ~/ 1.6;
     stackDiv.style.setProperty('height', '${stackHeight}px');
 
     // Wire the debugger object to the stack, console, and command line.
     var stackElement = $['stackElement'];
     debugger.stackElement = stackElement;
     stackElement.debugger = debugger;
     debugger.console = $['console'];
-    $['commandline'].debugger = debugger;
+    debugger.input = $['commandline'];
+    debugger.input.debugger = debugger;
     debugger.init();
   }
-
 }
 
 @CustomTag('debugger-stack')
 class DebuggerStackElement extends ObservatoryElement {
   @published Isolate isolate;
   @observable bool hasStack = false;
   @observable bool hasMessages = false;
   @observable bool isSampled = false;
   @observable int currentFrame;
   ObservatoryDebugger debugger;
@@ skipping 432 matching lines @@
             busy = false;
             break;
 
           default:
             busy = false;
             break;
         }
       });
   }
 
+  void focus() {
+    $['textBox'].focus();
+  }
+
   DebuggerInputElement.created() : super.created();
 }