| Index: Source/core/rendering/RenderBlock.cpp
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| diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
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| index 871d97aec96b0d3ee1f98998eca8c56623403f90..9dc25d8d0f9a95150157b89e15873d0fa9d37145 100644
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| --- a/Source/core/rendering/RenderBlock.cpp
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| +++ b/Source/core/rendering/RenderBlock.cpp
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| @@ -5174,7 +5174,7 @@ LayoutUnit RenderBlock::pageRemainingLogicalHeightForOffset(LayoutUnit offset, P
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|  
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|  LayoutUnit RenderBlock::adjustForUnsplittableChild(RenderBox* child, LayoutUnit logicalOffset, bool includeMargins)
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|  {
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| -    bool checkColumnBreaks = view()->layoutState()->isPaginatingColumns();
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| +    bool checkColumnBreaks = view()->layoutState()->isPaginatingColumns() || flowThreadContainingBlock();
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|      bool checkPageBreaks = !checkColumnBreaks && view()->layoutState()->m_pageLogicalHeight;
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|      bool isUnsplittable = child->isUnsplittableForPagination() || (checkColumnBreaks && child->style()->columnBreakInside() == PBAVOID)
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|          || (checkPageBreaks && child->style()->pageBreakInside() == PBAVOID);
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| 
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