Sibling invalidation sets

Source/core/input/EventHandler.cpp

Index: Source/core/input/EventHandler.cpp
diff --git a/Source/core/input/EventHandler.cpp b/Source/core/input/EventHandler.cpp
index 3a33b3d9a6b371e4e96a54c24c9daf0328626ad9..f80746f09a23e711b7d8464051909fd783bb00e9 100644
--- a/Source/core/input/EventHandler.cpp
+++ b/Source/core/input/EventHandler.cpp
@@ -2121,8 +2121,13 @@ bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& target
 
     bool swallowed = swallowMouseDownEvent | swallowMouseUpEvent | swallowClickEvent;
     if (!swallowed && tappedNode && m_frame->page()) {
-        bool domTreeChanged = preDispatchDomTreeVersion != m_frame->document()->domTreeVersion();
-        bool styleChanged = preDispatchStyleVersion != m_frame->document()->styleVersion();
+        Document* document = m_frame->document();
+        bool domTreeChanged = preDispatchDomTreeVersion != document->domTreeVersion();
+        bool styleChanged = preDispatchStyleVersion != document->styleVersion();
+        if (!styleChanged) {

[Timothy Loh, 2015/09/10 06:09:40]

Why did this have to change?

+            if (Element* documentElement = document->documentElement())
+                styleChanged = documentElement->childNeedsStyleInvalidation();
+        }
 
         IntPoint tappedPositionInViewport = m_frame->page()->frameHost().visualViewport().rootFrameToViewport(tappedPosition);
         m_frame->chromeClient().showUnhandledTapUIIfNeeded(tappedPositionInViewport, tappedNode.get(), domTreeChanged || styleChanged);