Prepare height calculation methods in LayoutFlowThread for nested multicol.

Source/core/layout/MultiColumnFragmentainerGroup.cpp

Index: Source/core/layout/MultiColumnFragmentainerGroup.cpp
diff --git a/Source/core/layout/MultiColumnFragmentainerGroup.cpp b/Source/core/layout/MultiColumnFragmentainerGroup.cpp
index f5fae65a4c9ba956c71467b4e89411b236c1136f..81e71d9c2b950e68b23f109ba396d4d15ebdfbb9 100644
--- a/Source/core/layout/MultiColumnFragmentainerGroup.cpp
+++ b/Source/core/layout/MultiColumnFragmentainerGroup.cpp
@@ -487,7 +487,7 @@ unsigned MultiColumnFragmentainerGroup::columnIndexAtVisualPoint(const LayoutPoi
 {
     bool isColumnProgressionInline = m_columnSet.multiColumnFlowThread()->progressionIsInline();
     bool isHorizontalWritingMode = m_columnSet.isHorizontalWritingMode();
-    LayoutUnit columnLengthInColumnProgressionDirection = isColumnProgressionInline ? m_columnSet.pageLogicalWidth() : m_columnSet.pageLogicalHeight();
+    LayoutUnit columnLengthInColumnProgressionDirection = isColumnProgressionInline ? m_columnSet.pageLogicalWidth() : logicalHeight();
     LayoutUnit offsetInColumnProgressionDirection = isHorizontalWritingMode == isColumnProgressionInline ? visualPoint.x() : visualPoint.y();
     if (!m_columnSet.style()->isLeftToRightDirection() && isColumnProgressionInline)
         offsetInColumnProgressionDirection = m_columnSet.logicalWidth() - offsetInColumnProgressionDirection;