Reset all EventHandler data members in EventHandler::clear()

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 824ae35d027e5e07ee0809738e5ffff2216c2d3b..822f28a2e5ebb5e503a76e73c21dee69106a853e 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -304,6 +304,19 @@ void EventHandler::clear()
     m_mouseDownMayStartDrag = false;
     m_lastShowPressTimestamp = 0;
     m_lastDeferredTapElement = nullptr;
+    m_eventHandlerWillResetCapturingMouseEventsNode = false;
+    m_mouseDownWasSingleClickInSelection = false;
+    m_selectionInitiationState = HaveNotStartedSelection;
+    m_mouseDownMayStartAutoscroll = false;
+    m_svgPan = false;
+    m_mouseDownPos = IntPoint();
+    m_mouseDownTimestamp = 0;
+    m_longTapShouldInvokeContextMenu = false;
+    m_dragStartPos = LayoutPoint();
+    m_offsetFromResizeCorner = LayoutSize();
+    m_currentMouseCursor = Cursor();
+    m_mouseDown = PlatformMouseEvent();
+
 }
 
 void EventHandler::nodeWillBeRemoved(Node& nodeToBeRemoved)