Content of cell should avoid repeating headers when it straddles multiple pages

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
@@ skipping 5569 matching lines @@
   return pageRemainingLogicalHeightForOffset(offset, AssociateWithLatterPage) <
          logicalHeight;
 }
 
 LayoutUnit LayoutBox::calculatePaginationStrutToFitContent(
     LayoutUnit offset,
     LayoutUnit strutToNextPage,
     LayoutUnit contentLogicalHeight) const {
   ASSERT(strutToNextPage ==
          pageRemainingLogicalHeightForOffset(offset, AssociateWithLatterPage));
+  // If we're a cell in a row that straddles a page then avoid the repeating
+  // header group if necessary.
+  if (isTableCell()) {
+    LayoutTableCell* cell = toLayoutTableCell(const_cast<LayoutBox*>(this));

[mstensho (USE GERRIT), 2016/12/20 11:47:00]

Why not keep the constness?

+    if (!cell->row()->isFirstRowInSectionAfterHeader())
+      strutToNextPage += cell->table()->rowOffsetFromRepeatingHeader();
+  }
   LayoutUnit nextPageLogicalTop = offset + strutToNextPage;
   if (pageLogicalHeightForOffset(nextPageLogicalTop) >= contentLogicalHeight)
     return strutToNextPage;  // Content fits just fine in the next page or
                              // column.
 
   // Moving to the top of the next page or column doesn't result in enough space
   // for the content that we're trying to fit. If we're in a nested
   // fragmentation context, we may find enough space if we move to a column
   // further ahead, by effectively breaking to the next outer fragmentainer.
   LayoutFlowThread* flowThread = flowThreadContainingBlock();
@@ skipping 60 matching lines @@
     block->adjustChildDebugRect(rect);
 
   return rect;
 }
 
 bool LayoutBox::shouldClipOverflow() const {
   return hasOverflowClip() || styleRef().containsPaint() || hasControlClip();
 }
 
 }  // namespace blink