:hover style not applied on hover if its display property is different from original style's

Source/core/dom/ContainerNode.cpp

Index: Source/core/dom/ContainerNode.cpp
diff --git a/Source/core/dom/ContainerNode.cpp b/Source/core/dom/ContainerNode.cpp
index 44ddbc088cf207c3aa5e83ebffb88c953a5f7084..ef3a25450362ffb03191dfa227dd3cac11f5b367 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -731,17 +731,17 @@ void ContainerNode::dispatchPostAttachCallbacks()
     s_postAttachCallbackQueue->clear();
 }
 
-void ContainerNode::attach()
+void ContainerNode::attach(const AttachContext& context)
 {
     attachChildren();
-    Node::attach();
+    Node::attach(context);
 }
 
-void ContainerNode::detach()
+void ContainerNode::detach(const AttachContext& context)
 {
     detachChildren();
     clearChildNeedsStyleRecalc();
-    Node::detach();
+    Node::detach(context);
 }
 
 void ContainerNode::childrenChanged(bool changedByParser, Node*, Node*, int childCountDelta)
@@ -793,6 +793,18 @@ void ContainerNode::setHovered(bool over)
 
     Node::setHovered(over);
 
+    if (!renderer()) {
+        // When setting hover to false, the style needs to be recalc'd even when
+        // there's no renderer (imagine setting display:none in the :hover class,
+        // if a nil renderer would prevent this element from recalculating its
+        // style, it would never go back to its normal style and remain
+        // stuck in its hovered style).
+        if (!over)
+            setNeedsStyleRecalc();
+
+        return;
+    }
+
     // note that we need to recalc the style
     // FIXME: Move to Element
     if (renderer()) {