column-span:all in nested multicol requires re-insertion of fragmentainer groups.

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h

 /*
  * Copyright (C) 2012 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 17 matching lines @@
 #define LayoutMultiColumnFlowThread_h
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutFlowThread.h"
 
 namespace blink {
 
 class LayoutMultiColumnSet;
 class LayoutMultiColumnSpannerPlaceholder;
 
-enum BalancedColumnHeightCalculation { GuessFromFlowThreadPortion, StretchBySpaceShortage };
-
 // Flow thread implementation for CSS multicol. This will be inserted as an anonymous child block of
 // the actual multicol container (i.e. the LayoutBlockFlow whose style computes to non-auto
 // column-count and/or column-width). LayoutMultiColumnFlowThread is the heart of the multicol
 // implementation, and there is only one instance per multicol container. Child content of the
 // multicol container is parented into the flow thread at the time of layoutObject insertion.
 //
 // Apart from this flow thread child, the multicol container will also have LayoutMultiColumnSet
 // children, which are used to position the columns visually. The flow thread is in charge
 // of layout, and, after having calculated the column width, it lays out content as if everything
 // were in one tall single column, except that there will typically be some amount of blank space
@@ skipping 122 matching lines @@
     bool isPageLogicalHeightKnown() const final;
 
     LayoutSize flowThreadTranslationAtOffset(LayoutUnit) const;
 
     LayoutPoint visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const override;
 
     LayoutMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const final;
 
     void layoutColumns(SubtreeLayoutScope&);
 
-    bool isInInitialLayoutPass() const { return !m_inBalancingPass; }
-
     // Skip past a column spanner during flow thread layout. Spanners are not laid out inside the
     // flow thread, since the flow thread is not in a spanner's containing block chain (since the
     // containing block is the multicol container).
     void skipColumnSpanner(LayoutBox*, LayoutUnit logicalTopInFlowThread);
 
     bool recalculateColumnHeights();
 
     void columnRuleStyleDidChange();
 
     // Remove the spanner placeholder and return true if the specified object is no longer a valid spanner.
@@ skipping 54 matching lines @@
     bool m_isBeingEvacuated;
 };
 
 // Cannot use DEFINE_LAYOUT_OBJECT_TYPE_CASTS here, because isMultiColumnFlowThread() is defined in
 // LayoutFlowThread, not in LayoutObject.
 DEFINE_TYPE_CASTS(LayoutMultiColumnFlowThread, LayoutFlowThread, object, object->isLayoutMultiColumnFlowThread(), object.isLayoutMultiColumnFlowThread());
 
 } // namespace blink
 
 #endif // LayoutMultiColumnFlowThread_h