Clear undo stack when text control is set programatically

Source/core/html/HTMLTextFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 15 matching lines @@
 #include "core/html/HTMLTextFormControlElement.h"
 
 #include "HTMLNames.h"
 #include "bindings/v8/ExceptionState.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/accessibility/AXObjectCache.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
+#include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/TextIterator.h"
 #include "core/events/Event.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderTheme.h"
@@ skipping 460 matching lines @@
     bool textIsChanged = value != innerTextValue();
     if (textIsChanged || !innerTextElement()->hasChildren()) {
         if (textIsChanged && renderer()) {
             if (AXObjectCache* cache = document().existingAXObjectCache())
                 cache->postNotification(this, AXObjectCache::AXValueChanged, false);
         }
         innerTextElement()->setInnerText(value, ASSERT_NO_EXCEPTION);
 
         if (value.endsWith('\n') || value.endsWith('\r'))
             innerTextElement()->appendChild(HTMLBRElement::create(document()));
+
+        if (LocalFrame* frame = document().frame())
+            frame->editor().clearUndoStack();
     }
 
     setFormControlValueMatchesRenderer(true);
 }
 
 static String finishText(StringBuilder& result)
 {
     // Remove one trailing newline; there's always one that's collapsed out by rendering.
     size_t size = result.length();
     if (size && result[size - 1] == '\n')
@@ skipping 121 matching lines @@
 
     return "ltr";
 }
 
 HTMLElement* HTMLTextFormControlElement::innerTextElement() const
 {
     return toHTMLElement(userAgentShadowRoot()->getElementById(ShadowElementNames::innerEditor()));
 }
 
 } // namespace Webcore