Implement select element list box with shadow DOM.

Source/WebCore/page/EventHandler.cpp

Index: Source/WebCore/page/EventHandler.cpp
diff --git a/Source/WebCore/page/EventHandler.cpp b/Source/WebCore/page/EventHandler.cpp
index 216a6ed138bdce0c360acc2f82e08c577ce83e99..55d898cd3735975be9de986d5fae5b206df785c1 100644
--- a/Source/WebCore/page/EventHandler.cpp
+++ b/Source/WebCore/page/EventHandler.cpp
@@ -674,7 +674,7 @@ bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& eve
         swallowEvent = handleMousePressEventTripleClick(event);
     else
         swallowEvent = handleMousePressEventSingleClick(event);
-    
+
     m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
         || (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
 
@@ -693,24 +693,8 @@ bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& e
     if (event.event().button() != LeftButton || !targetNode)
         return false;
 
-    RenderObject* renderer = targetNode->renderer();
-    if (!renderer) {
-        Node* parent = EventPathWalker::parent(targetNode);
-        if (!parent)
-            return false;
-
-        renderer = parent->renderer();
-        if (!renderer || !renderer->isListBox())
-            return false;
-    }
-
     m_mouseDownMayStartDrag = false;
 
-    if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
-        m_autoscrollController->startAutoscrollForSelection(renderer);
-        m_mouseDownMayStartAutoscroll = false;
-    }
-
     if (m_selectionInitiationState != ExtendedSelection) {
         HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
         HitTestResult result(m_mouseDownPos);
@@ -1665,6 +1649,22 @@ bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& mouseEvent, Hi
         return true;
     
     swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true);
+
+    RenderObject* renderer = targetNode->renderer();
+    if (!renderer) {
+        Node* parent = EventPathWalker::parent(targetNode);
+        if (!parent)
+            return false;
+
+        renderer = parent->renderer();
+        if (!renderer || !renderer->isListBox())
+            return false;
+    }
+
+    if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
+        m_autoscrollController->startAutoscrollForSelection(renderer);
+        m_mouseDownMayStartAutoscroll = false;
+    }
     if (!swallowEvent)
         swallowEvent = handleMouseDraggedEvent(mev);
 
@@ -1996,7 +1996,7 @@ MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestReques
 {
     ASSERT(m_frame);
     ASSERT(m_frame->document());
-    
+
     return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
 }