Fix issue on <select> style change when popup is visible

Source/core/layout/LayoutMenuList.cpp

Index: Source/core/layout/LayoutMenuList.cpp
diff --git a/Source/core/layout/LayoutMenuList.cpp b/Source/core/layout/LayoutMenuList.cpp
index 2c696e7b02aa4e781a70919ef8429e2991d34cc4..03fb69df686c6b072067483976dca090b9ba83bb 100644
--- a/Source/core/layout/LayoutMenuList.cpp
+++ b/Source/core/layout/LayoutMenuList.cpp
@@ -59,6 +59,7 @@ LayoutMenuList::LayoutMenuList(Element* element)
     , m_optionsWidth(0)
     , m_lastActiveIndex(-1)
     , m_popupIsVisible(false)
+    , m_popupTemporarySelectedIndex(-1)
 {
     ASSERT(isHTMLSelectElement(element));
 }
@@ -210,7 +211,9 @@ void LayoutMenuList::updateFromElement()
     if (m_popupIsVisible)
         m_popup->updateFromElement();
 
-    if (selectElement()->suggestedIndex() >= 0)
+    if (m_popupTemporarySelectedIndex >= 0)
+        setTextFromOption(selectElement()->listToOptionIndex(m_popupTemporarySelectedIndex));
+    else if (selectElement()->suggestedIndex() >= 0)
         setTextFromOption(selectElement()->suggestedIndex());
     else
         setTextFromOption(selectElement()->selectedIndex());
@@ -571,6 +574,10 @@ int LayoutMenuList::selectedIndex() const
 void LayoutMenuList::popupDidHide()
 {
     m_popupIsVisible = false;
+    if (m_popupTemporarySelectedIndex >= 0) {
+        valueChanged(m_popupTemporarySelectedIndex);
+        m_popupTemporarySelectedIndex = -1;
+    }
 }
 
 bool LayoutMenuList::itemIsSeparator(unsigned listIndex) const
@@ -594,9 +601,10 @@ bool LayoutMenuList::itemIsSelected(unsigned listIndex) const
     return isHTMLOptionElement(*element) && toHTMLOptionElement(*element).selected();
 }
 
-void LayoutMenuList::setTextFromItem(unsigned listIndex)
+void LayoutMenuList::setProvisionallySelectedListIndex(unsigned listIndex)
 {
-    setTextFromOption(selectElement()->listToOptionIndex(listIndex));
+    m_popupTemporarySelectedIndex = listIndex;
+    setTextFromOption(selectElement()->listToOptionIndex(m_popupTemporarySelectedIndex));
 }
 
 } // namespace blink