The selection bounds should be clipped to the viewport

Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 183 matching lines @@
     void setFocusedNodeIfNeeded();
     void notifyRendererOfSelectionChange(EUserTriggered);
 
     EditingStyle* typingStyle() const;
     void setTypingStyle(PassRefPtrWillBeRawPtr<EditingStyle>);
     void clearTypingStyle();
 
     String selectedText() const;
     String selectedTextForClipboard() const;
 
-    FloatRect bounds() const;
+    // The bounds are clipped to the viewport as this is what callers expect.
+    LayoutRect bounds() const;
+    LayoutRect unclippedBounds() const;
 
     HTMLFormElement* currentForm() const;
 
     void revealSelection(const ScrollAlignment& = ScrollAlignment::alignCenterIfNeeded, RevealExtentOption = DoNotRevealExtent);
     void setSelectionFromNone();
 
     void setShouldShowBlockCursor(bool);
 
     // VisibleSelection::ChangeObserver interface.
     virtual void didChangeVisibleSelection() override;
@@ skipping 91 matching lines @@
 }
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h