Prevent SVG children from participating in an ancestor multicol context.

Source/core/layout/LayoutState.cpp

Index: Source/core/layout/LayoutState.cpp
diff --git a/Source/core/layout/LayoutState.cpp b/Source/core/layout/LayoutState.cpp
index 744412af8da58ffbd65a43c665cd31996f063b78..d434e2cc013ebc0a19b759351cf420e73fc85559 100644
--- a/Source/core/layout/LayoutState.cpp
+++ b/Source/core/layout/LayoutState.cpp
@@ -83,6 +83,10 @@ LayoutState::LayoutState(LayoutBox& layoutObject, const LayoutSize& offset, Layo
             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;
+        ASSERT(!m_isPaginated);
     } 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;