Fragment blocks with non-visible overflow as normally when printing.

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 4247 matching lines @@
     return computePercentageLogicalHeight(fakeLength) != -1;
 }
 
 bool LayoutBox::hasUnsplittableScrollingOverflow() const
 {
     // We will paginate as long as we don't scroll overflow in the pagination direction.
     bool isHorizontal = isHorizontalWritingMode();
     if ((isHorizontal && !scrollsOverflowY()) || (!isHorizontal && !scrollsOverflowX()))
         return false;
 
+    // Fragmenting scrollbars is only problematic in interactive media, e.g. multicol on a
+    // screen. If we're printing, which is non-interactive media, we should allow objects with
+    // non-visible overflow to be paginated as normally.
+    if (document().printing())
+        return false;
+
     // We do have overflow. We'll still be willing to paginate as long as the block
     // has auto logical height, auto or undefined max-logical-height and a zero or auto min-logical-height.
     // Note this is just a heuristic, and it's still possible to have overflow under these
     // conditions, but it should work out to be good enough for common cases. Paginating overflow
     // with scrollbars present is not the end of the world and is what we used to do in the old model anyway.
     return !style()->logicalHeight().isIntrinsicOrAuto()
         || (!style()->logicalMaxHeight().isIntrinsicOrAuto() && !style()->logicalMaxHeight().isMaxSizeNone() && (!style()->logicalMaxHeight().hasPercent() || percentageLogicalHeightIsResolvable()))
         || (!style()->logicalMinHeight().isIntrinsicOrAuto() && style()->logicalMinHeight().isPositive() && (!style()->logicalMinHeight().hasPercent() || percentageLogicalHeightIsResolvable()));
 }
 
@@ skipping 584 matching lines @@
         m_rareData->m_snapAreas->remove(&snapArea);
     }
 }
 
 SnapAreaSet* LayoutBox::snapAreas() const
 {
     return m_rareData ? m_rareData->m_snapAreas.get() : nullptr;
 }
 
 } // namespace blink