Introduce isVisuallyEquivalentCandidate() as replacement of PositionAlgorithm::isCandidate()

Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 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 1264 matching lines @@
 }
 
 IntRect FrameSelection::absoluteCaretBounds()
 {
     ASSERT(m_frame->document()->lifecycle().state() != DocumentLifecycle::InPaintInvalidation);
     m_frame->document()->updateLayoutIgnorePendingStylesheets();
     if (!isNonOrphanedCaret(m_selection)) {
         clearCaretRect();
     } else {
         if (isTextFormControl(m_selection))
-            updateCaretRect(PositionWithAffinity(m_selection.start().isCandidate() ? m_selection.start() : Position(), m_selection.affinity()));
+            updateCaretRect(PositionWithAffinity(isVisuallyEquivalentCandidate(m_selection.start()) ? m_selection.start() : Position(), m_selection.affinity()));
         else
             updateCaretRect(VisiblePosition(m_selection.start(), m_selection.affinity()));
     }
     return absoluteBoundsForLocalRect(m_selection.start().anchorNode(), localCaretRectWithoutUpdate());
 }
 
 static LayoutRect localCaretRect(const VisibleSelection& m_selection, const PositionWithAffinity& caretPosition, LayoutObject*& layoutObject)
 {
     layoutObject = nullptr;
     if (!isNonOrphanedCaret(m_selection))
@@ skipping 762 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif