Use VisibleSelection::InDOMTree::equalSelections() instead of operator==()

Source/core/editing/SelectionController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 48 matching lines @@
 {
 }
 
 DEFINE_TRACE(SelectionController)
 {
     visitor->trace(m_frame);
 }
 
 static void setSelectionIfNeeded(FrameSelection& selection, const VisibleSelection& newSelection)
 {
-    if (selection.selection() != newSelection)
+    if (!VisibleSelection::InDOMTree::equalSelections(selection.selection(), newSelection))
         selection.setSelection(newSelection);
 }
 
 static inline bool dispatchSelectStart(Node* node)
 {
     if (!node || !node->layoutObject())
         return true;
 
     return node->dispatchEvent(Event::createCancelableBubble(EventTypeNames::selectstart));
 }
@@ skipping 519 matching lines @@
 {
     return m_mouseDownMayStartSelect;
 }
 
 bool SelectionController::mouseDownWasSingleClickInSelection() const
 {
     return m_mouseDownWasSingleClickInSelection;
 }
 
 } // namespace blink