Handle nested theads correctly when paginated

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 518 matching lines @@
         }
 
         Length logicalMinHeightLength = style()->logicalMinHeight();
         if (logicalMinHeightLength.isIntrinsic() || (logicalMinHeightLength.isSpecified() && !logicalMinHeightLength.isNegative())) {
             LayoutUnit computedMinLogicalHeight = convertStyleLogicalHeightToComputedHeight(logicalMinHeightLength);
             computedLogicalHeight = std::max(computedLogicalHeight, computedMinLogicalHeight);
         }
 
         distributeExtraLogicalHeight(floorToInt(computedLogicalHeight - totalSectionLogicalHeight));
 
+        bool isPaginated = view()->layoutState()->isPaginated();
         LayoutTableSection* topSection = this->topSection();
         LayoutUnit logicalOffset = topSection ? topSection->logicalTop() : LayoutUnit();
         for (LayoutTableSection* section = topSection; section; section = sectionBelow(section)) {
             section->setLogicalTop(logicalOffset);
             section->layoutRows();
             logicalOffset += section->logicalHeight();
+            if (isPaginated && m_head && m_head == section) {
+                LayoutUnit offsetForTableHeaders = state.heightOffsetForTableHeaders();
+                offsetForTableHeaders += section->logicalHeight();
+                state.setHeightOffsetForTableHeaders(offsetForTableHeaders);
+            }
         }
 
         if (!topSection && computedLogicalHeight > totalSectionLogicalHeight && !document().inQuirksMode()) {
             // Completely empty tables (with no sections or anything) should at least honor specified height
             // in strict mode.
             setLogicalHeight(logicalHeight() + computedLogicalHeight);
         }
 
         LayoutUnit sectionLogicalLeft = LayoutUnit(style()->isLeftToRightDirection() ? borderStart() : borderEnd());
         if (!collapsing)
@@ skipping 946 matching lines @@
 
 LayoutUnit LayoutTable::paddingRight() const
 {
     if (collapseBorders())
         return LayoutUnit();
 
     return LayoutBlock::paddingRight();
 }
 
 } // namespace blink