[New Multicolumn] balancer confused by content with top margins.

Source/core/rendering/LayoutState.cpp

Index: Source/core/rendering/LayoutState.cpp
diff --git a/Source/core/rendering/LayoutState.cpp b/Source/core/rendering/LayoutState.cpp
index e9cb94b10e2472b672b4caf5e24b973d10338639..d50da0e3b09e0289380d6521406d5dc405fd8d85 100644
--- a/Source/core/rendering/LayoutState.cpp
+++ b/Source/core/rendering/LayoutState.cpp
@@ -89,6 +89,7 @@ LayoutState::LayoutState(LayoutState* prev, RenderBox& renderer, const LayoutSiz
         m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer.borderLeft() + renderer.paddingLeft() : renderer.borderRight() + renderer.paddingRight()),
             m_layoutOffset.height() + (!isFlipped ? renderer.borderTop() + renderer.paddingTop() : renderer.borderBottom() + renderer.paddingBottom()));
         m_pageLogicalHeightChanged = pageLogicalHeightChanged;
+        m_isPaginated = true;
     } 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;
@@ -97,8 +98,12 @@ LayoutState::LayoutState(LayoutState* prev, RenderBox& renderer, const LayoutSiz
 
         // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
         // writing mode roots.
-        if (renderer.isUnsplittableForPagination())
+        if (renderer.isUnsplittableForPagination()) {
             m_pageLogicalHeight = 0;
+            m_isPaginated = false;
+        } else {
+            m_isPaginated = m_pageLogicalHeight || m_next->m_columnInfo || renderer.flowThreadContainingBlock();
+        }
     }
 
     if (!m_columnInfo)
@@ -119,8 +124,6 @@ LayoutState::LayoutState(LayoutState* prev, RenderBox& renderer, const LayoutSiz
 #endif
     }
 
-    m_isPaginated = m_pageLogicalHeight || m_columnInfo || renderer.isRenderFlowThread();
-
     // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
 }