Need to take an element's scroll offset into account when painting its column rules.

Source/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 3121 matching lines @@
             frame()->selection()->paintCaret(paintInfo.context, paintOffset, paintInfo.rect);
         else
             frame()->page()->dragCaretController()->paintDragCaret(frame(), paintInfo.context, paintOffset, paintInfo.rect);
     }
 }
 
 void RenderBlock::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     PaintPhase paintPhase = paintInfo.phase;
 
+    // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).
+    LayoutPoint scrolledOffset = paintOffset;
+    if (hasOverflowClip())
+        scrolledOffset.move(-scrolledContentOffset());
+
     // 1. paint background, borders etc
     if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && style()->visibility() == VISIBLE) {
         if (hasBoxDecorations())
             paintBoxDecorations(paintInfo, paintOffset);
         if (hasColumns() && !paintInfo.paintRootBackgroundOnly())
-            paintColumnRules(paintInfo, paintOffset);
+            paintColumnRules(paintInfo, scrolledOffset);
     }
 
     if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) {
         paintMask(paintInfo, paintOffset);
         return;
     }
 
     // We're done.  We don't bother painting any children.
     if (paintPhase == PaintPhaseBlockBackground || paintInfo.paintRootBackgroundOnly())
         return;
 
-    // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).
-    LayoutPoint scrolledOffset = paintOffset;
-    if (hasOverflowClip())
-        scrolledOffset.move(-scrolledContentOffset());
-
     // 2. paint contents
     if (paintPhase != PaintPhaseSelfOutline) {
         if (hasColumns())
             paintColumnContents(paintInfo, scrolledOffset);
         else
             paintContents(paintInfo, scrolledOffset);
     }
 
     // 3. paint selection
     // FIXME: Make this work with multi column layouts.  For now don't fill gaps.
@@ skipping 4940 matching lines @@
 {
     memoryInstrumentation->addRootObject(gColumnInfoMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gPositionedDescendantsMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gPercentHeightDescendantsMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gPositionedContainerMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gPercentHeightContainerMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gDelayedUpdateScrollInfoSet, WebCoreMemoryTypes::RenderingStructures);
 }
 
 } // namespace WebCore