Skip PositionedMovementLayout when descendants depend on element's height

Source/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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.
  *
@@ skipping 506 matching lines @@
     virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
 
     virtual void paintObject(const PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); }
     virtual void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&);
     virtual void paintMask(const PaintInfo&, const LayoutPoint&);
     virtual void paintClippingMask(const PaintInfo&, const LayoutPoint&);
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
 
     void logicalExtentAfterUpdatingLogicalWidth(const LayoutUnit& logicalTop, LogicalExtentComputedValues&);
 
-    // Called when a positioned object moves but doesn't necessarily change size.  A simplified layout is attempted
-    // that just updates the object's position. If the size does change, the object remains dirty.
-    bool tryLayoutDoingPositionedMovementOnly()
-    {
-        LayoutUnit oldWidth = logicalWidth();
-        LogicalExtentComputedValues computedValues;
-        logicalExtentAfterUpdatingLogicalWidth(logicalTop(), computedValues);
-        // If we shrink to fit our width may have changed, so we still need full layout.
-        if (oldWidth != computedValues.m_extent)
-            return false;
-        setLogicalWidth(computedValues.m_extent);
-        setLogicalLeft(computedValues.m_position);
-        setMarginStart(computedValues.m_margins.m_start);
-        setMarginEnd(computedValues.m_margins.m_end);
-        updateLogicalHeight();
-        return true;
-    }
-
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;
 
     void removeFloatingOrPositionedChildFromBlockLists();
 
     RenderLayer* enclosingFloatPaintingLayer() const;
 
     virtual int firstLineBoxBaseline() const { return -1; }
     virtual int inlineBlockBaseline(LineDirectionMode) const { return -1; } // Returns -1 if we should skip this box when computing the baseline of an inline-block.
 
     bool shrinkToAvoidFloats() const;
@@ skipping 314 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif // RenderBox_h