Turn off autofill highlight when changing option in an autofilled <select> element

Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * 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, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 64 matching lines @@
     , m_typeAhead(this)
     , m_size(0)
     , m_lastOnChangeIndex(-1)
     , m_activeSelectionAnchorIndex(-1)
     , m_activeSelectionEndIndex(-1)
     , m_isProcessingUserDrivenChange(false)
     , m_multiple(false)
     , m_activeSelectionState(false)
     , m_shouldRecalcListItems(false)
     , m_suggestedIndex(-1)
+    , m_isAutofilledByPreview(false)
 {
 }
 
 PassRefPtrWillBeRawPtr<HTMLSelectElement> HTMLSelectElement::create(Document& document)
 {
     RefPtrWillBeRawPtr<HTMLSelectElement> select = adoptRefWillBeNoop(new HTMLSelectElement(document, 0));
     select->ensureUserAgentShadowRoot();
     return select.release();
 }
 
@@ skipping 167 matching lines @@
                     break;
                 optionIndex++;
             }
         }
         if (optionIndex >= static_cast<int>(items.size()))
             optionIndex = -1;
     }
 
     int previousSelectedIndex = selectedIndex();
     setSuggestedIndex(-1);
+    if (m_isAutofilledByPreview)
+        setAutofilled(false);
     setSelectedIndex(optionIndex);
 
     if (sendEvents && previousSelectedIndex != selectedIndex()) {
         if (usesMenuList())
             dispatchInputAndChangeEventForMenuList(false);
         else
             listBoxOnChange();
     }
 }
 
@@ skipping 15 matching lines @@
         setSuggestedIndex(-1);
         return;
     }
 
     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& items = listItems();
     unsigned optionIndex = 0;
     for (unsigned i = 0; i < items.size(); ++i) {
         if (isHTMLOptionElement(items[i])) {
             if (toHTMLOptionElement(items[i])->value() == value) {
                 setSuggestedIndex(optionIndex);
+                m_isAutofilledByPreview = true;
                 return;
             }
             optionIndex++;
         }
     }
 
     setSuggestedIndex(-1);
 }
 
 bool HTMLSelectElement::isPresentationAttribute(const QualifiedName& name) const
@@ skipping 600 matching lines @@
         setAutofilled(false);
 }
 
 void HTMLSelectElement::selectOption(int optionIndex, SelectOptionFlags flags)
 {
     bool shouldDeselect = !m_multiple || (flags & DeselectOtherOptions);
 
     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& items = listItems();
     int listIndex = optionToListIndex(optionIndex);
 
+    if (selectedIndex() != optionIndex && this->isAutofilled())
+        setAutofilled(false);
+
     HTMLElement* element = 0;
     if (listIndex >= 0) {
         element = items[listIndex];
         if (isHTMLOptionElement(*element)) {
             if (m_activeSelectionAnchorIndex < 0 || shouldDeselect)
                 setActiveSelectionAnchorIndex(listIndex);
             if (m_activeSelectionEndIndex < 0 || shouldDeselect)
                 setActiveSelectionEndIndex(listIndex);
             toHTMLOptionElement(*element).setSelectedState(true);
         }
@@ skipping 804 matching lines @@
     int focusedIndex = activeSelectionEndListIndex();
     if (focusedIndex < 0)
         focusedIndex = firstSelectableListIndex();
     if (focusedIndex < 0)
         return nullptr;
     HTMLElement* focused = listItems()[focusedIndex];
     return isHTMLOptionElement(focused) ? toHTMLOptionElement(focused) : nullptr;
 }
 
 } // namespace