Fix positioning of "text-underline-position:under" for multi-elements

third_party/WebKit/Source/core/layout/line/InlineFlowBox.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 375 matching lines @@
                                         const LayoutRect& logicalVisualOverflow,
                                         LayoutUnit lineTop,
                                         LayoutUnit lineBottom) {
     // If we are setting an overflow, then we can't pretend not to have an
     // overflow.
     clearKnownToHaveNoOverflow();
     setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow,
                                 lineTop, lineBottom);
   }
 
+  LayoutUnit maxLogicalBottomForUnderline(LineLayoutItem decorationObject,
+                                          LayoutUnit maxLogicalBottom) const;
+  LayoutUnit minLogicalTopForUnderline(LineLayoutItem decorationObject,
+                                       LayoutUnit minLogicalTop) const;
+
  private:
   void placeBoxRangeInInlineDirection(InlineBox* firstChild,
                                       InlineBox* lastChild,
                                       LayoutUnit& logicalLeft,
                                       LayoutUnit& minLogicalLeft,
                                       LayoutUnit& maxLogicalRight,
                                       bool& needsWordSpacing);
   void beginPlacingBoxRangesInInlineDirection(LayoutUnit logicalLeft) {
     setLogicalLeft(logicalLeft);
   }
@@ skipping 30 matching lines @@
 
   bool isInlineFlowBox() const final { return true; }
 
   InlineBox* m_firstChild;
   InlineBox* m_lastChild;
 
   InlineFlowBox*
       m_prevLineBox;  // The previous box that also uses our LayoutObject
   InlineFlowBox* m_nextLineBox;  // The next box that also uses our LayoutObject
 
-  // Maximum logicalTop among all children of an InlineFlowBox. Used to
-  // calculate the offset for TextUnderlinePositionUnder.
-  void computeMaxLogicalTop(LayoutUnit& maxLogicalTop) const;
-
  private:
   unsigned m_includeLogicalLeftEdge : 1;
   unsigned m_includeLogicalRightEdge : 1;
   unsigned m_hasTextChildren : 1;
   unsigned m_hasTextDescendants : 1;
   unsigned m_descendantsHaveSameLineHeightAndBaseline : 1;
 
  protected:
   // The following members are only used by RootInlineBox but moved here to keep
   // the bits packed.
@@ skipping 28 matching lines @@
 
 inline void InlineFlowBox::setHasBadChildList() {
 #if DCHECK_IS_ON()
   m_hasBadChildList = true;
 #endif
 }
 
 }  // namespace blink
 
 #endif  // InlineFlowBox_h