Empty inline elements always get a line box.

Source/core/rendering/line/TrailingObjects.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2014 Adobe Systems Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  *
  */
 
 #include "config.h"
 #include "core/rendering/line/TrailingObjects.h"
 
 #include "core/rendering/InlineIterator.h"
 
 namespace WebCore {
 
-void TrailingObjects::updateMidpointsForTrailingBoxes(LineMidpointState& lineMidpointState, const InlineIterator& lBreak, CollapseFirstSpaceOrNot collapseFirstSpace)
+void TrailingObjects::updateMidpointsForTrailingObjects(LineMidpointState& lineMidpointState, const InlineIterator& lBreak, CollapseFirstSpaceOrNot collapseFirstSpace)
 {
     if (!m_whitespace)
         return;
 
     // This object is either going to be part of the last midpoint, or it is going to be the actual endpoint.
     // In both cases we just decrease our pos by 1 level to exclude the space, allowing it to - in effect - collapse into the newline.
     if (lineMidpointState.numMidpoints() % 2) {
         // Find the trailing space object's midpoint.
         int trailingSpaceMidpoint = lineMidpointState.numMidpoints() - 1;
         for ( ; trailingSpaceMidpoint > 0 && lineMidpointState.midpoints()[trailingSpaceMidpoint].object() != m_whitespace; --trailingSpaceMidpoint) { }
         ASSERT(trailingSpaceMidpoint >= 0);
         if (collapseFirstSpace == CollapseFirstSpace)
             lineMidpointState.midpoints()[trailingSpaceMidpoint].setOffset(lineMidpointState.midpoints()[trailingSpaceMidpoint].offset() -1);
 
         // Now make sure every single trailingPositionedBox following the trailingSpaceMidpoint properly stops and starts
         // ignoring spaces.
         size_t currentMidpoint = trailingSpaceMidpoint + 1;
-        for (size_t i = 0; i < m_boxes.size(); ++i) {
+        for (size_t i = 0; i < m_objects.size(); ++i) {
             if (currentMidpoint >= lineMidpointState.numMidpoints()) {
                 // We don't have a midpoint for this box yet.
-                lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_boxes[i]);
+                lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_objects[i]);
             } else {
-                ASSERT(lineMidpointState.midpoints()[currentMidpoint].object() == m_boxes[i]);
-                ASSERT(lineMidpointState.midpoints()[currentMidpoint + 1].object() == m_boxes[i]);
+                ASSERT(lineMidpointState.midpoints()[currentMidpoint].object() == m_objects[i]);
+                ASSERT(lineMidpointState.midpoints()[currentMidpoint + 1].object() == m_objects[i]);
             }
             currentMidpoint += 2;
         }
     } else if (!lBreak.object()) {
         ASSERT(m_whitespace->isText());
         ASSERT(collapseFirstSpace == CollapseFirstSpace);
         // Add a new end midpoint that stops right at the very end.
         unsigned length = m_whitespace->textLength();
         unsigned pos = length >= 2 ? length - 2 : UINT_MAX;
         InlineIterator endMid(0, m_whitespace, pos);
         lineMidpointState.startIgnoringSpaces(endMid);
-        for (size_t i = 0; i < m_boxes.size(); ++i) {
-            lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_boxes[i]);
+        for (size_t i = 0; i < m_objects.size(); ++i) {
+            lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_objects[i]);
         }
     }
 }
 
 }