Clip abspos descendants correctly in all columns (not just the first).

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 1673 matching lines @@
 }
 
 LayoutSize LayoutBox::offsetFromContainer(const LayoutObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
 {
     ASSERT(o == container());
 
     LayoutSize offset;
     if (isInFlowPositioned())
         offset += offsetForInFlowPosition();
 
-    if (!isInline() || isReplaced()) {
+    if (!isInline() || isReplaced())
         offset += topLeftLocationOffset();
-        if (o->isLayoutFlowThread()) {
-            // So far the point has been in flow thread coordinates (i.e. as if everything in
-            // the fragmentation context lived in one tall single column). Convert it to a
-            // visual point now.
-            LayoutPoint pointInContainer = point + offset;
-            offset += o->columnOffset(pointInContainer);
-            if (offsetDependsOnPoint)
-                *offsetDependsOnPoint = true;
-        }
-    }
 
     if (o->hasOverflowClip())
         offset -= toLayoutBox(o)->scrolledContentOffset();
 
     if (style()->position() == AbsolutePosition && o->isInFlowPositioned() && o->isLayoutInline())
         offset += toLayoutInline(o)->offsetForInFlowPositionedInline(*this);
 
     return offset;
 }
 
@@ skipping 3134 matching lines @@
     StyleImage* borderImage = style()->borderImage().image();
     return borderImage && borderImage->canRender() && borderImage->isLoaded();
 }
 
 ShapeOutsideInfo* LayoutBox::shapeOutsideInfo() const
 {
     return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr;
 }
 
 } // namespace blink