Don't turn middleclicks into click events.

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 6194a5794262c63fe00e4e4d61d5e2904daa9d9f..0ae48eee81f728e08176cbb9630a37158d1e9798 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -1682,8 +1682,11 @@ bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
     if (mouseEvent.button() == LeftButton && mouseEvent.modifiers() & PlatformEvent::CtrlKey)
         contextMenuEvent = true;
 #endif
-
-    bool swallowClickEvent = m_clickCount > 0 && !contextMenuEvent && mouseIsReleasedOnPressedElement(mev.targetNode(), m_clickNode.get()) && !dispatchMouseEvent(EventNames::click, mev.targetNode(), true, m_clickCount, mouseEvent, true);
+    bool swallowClickEvent = false;
+    if (m_clickCount > 0 && !contextMenuEvent && mouseEvent.button() != MiddleButton && mouseIsReleasedOnPressedElement(mev.targetNode(), m_clickNode.get())) {
+        // Turn the Mouse Button Released event into a click event since all requirements are fulfilled.
+        swallowClickEvent = !dispatchMouseEvent(EventNames::click, mev.targetNode(), true, m_clickCount, mouseEvent, true);
+    }
 
     if (m_resizeLayer) {
         m_resizeLayer->setInResizeMode(false);