Prevent SVG children from participating in an ancestor multicol context.

Source/core/layout/LayoutState.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 65 matching lines @@
     }
     // If we establish a new page height, then cache the offset to the top of the first page.
     // We can compare this later on to figure out what part of the page we're actually on,
     if (pageLogicalHeight || m_columnInfo || layoutObject.isLayoutFlowThread()) {
         m_pageLogicalHeight = pageLogicalHeight;
         bool isFlipped = layoutObject.style()->isFlippedBlocksWritingMode();
         m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? layoutObject.borderLeft() + layoutObject.paddingLeft() : layoutObject.borderRight() + layoutObject.paddingRight()),
             m_layoutOffset.height() + (!isFlipped ? layoutObject.borderTop() + layoutObject.paddingTop() : layoutObject.borderBottom() + layoutObject.paddingBottom()));
         m_pageLogicalHeightChanged = pageLogicalHeightChanged;
         m_isPaginated = true;
+    } else if (m_layoutObject.isSVG() && !m_layoutObject.isSVGRoot()) {
+        // Pagination inside SVG is not allowed.
+        m_flowThread = nullptr;
+        m_pageLogicalHeightChanged = false;
+        m_isPaginated = false;
     } else {
         // If we don't establish a new page height, then propagate the old page height and offset down.
         m_pageLogicalHeight = m_next->m_pageLogicalHeight;
         m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
         m_pageOffset = m_next->m_pageOffset;
 
         // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
         // writing mode roots.
         if (layoutObject.isUnsplittableForPagination()) {
             m_pageLogicalHeight = 0;
@@ skipping 54 matching lines @@
 }
 
 void LayoutState::addForcedColumnBreak(const LayoutBox& child, const LayoutUnit& childLogicalOffset)
 {
     if (!m_columnInfo || m_columnInfo->columnHeight())
         return;
     m_columnInfo->addForcedBreak(pageLogicalOffset(child, childLogicalOffset));
 }
 
 } // namespace blink