1 files changed, 18 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/RenderMultiColumnBlock.cpp b/Source/WebCore/rendering/RenderMultiColumnBlock.cpp
index d29055e68..d7f43ff50 100644
--- a/Source/WebCore/rendering/RenderMultiColumnBlock.cpp
+++ b/Source/WebCore/rendering/RenderMultiColumnBlock.cpp
@@ -25,6 +25,7 @@
 
 #include "config.h"
 #include "RenderMultiColumnBlock.h"
+#include "RenderMultiColumnFlowThread.h"
 
 using namespace std;
 
@@ -32,6 +33,7 @@ namespace WebCore {
 
 RenderMultiColumnBlock::RenderMultiColumnBlock(Node* node)
     : RenderBlock(node)
+    , m_flowThread(0)
     , m_columnCount(1)
     , m_columnWidth(0)
 {
@@ -73,6 +75,22 @@ bool RenderMultiColumnBlock::recomputeLogicalWidth()
     return relayoutChildren;
 }
 
+void RenderMultiColumnBlock::addChild(RenderObject* newChild, RenderObject* beforeChild)
+{
+    if (!m_flowThread) {
+        m_flowThread = new (renderArena()) RenderMultiColumnFlowThread(document());
+        m_flowThread->setStyle(RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK));
+        RenderBlock::addChild(m_flowThread); // Always put the flow thread at the end.
+    }
+
+    // Column sets are siblings of the flow thread. All children designed to be in the columns, however, are part
+    // of the flow thread itself.
+    if (newChild->isRenderMultiColumnSet())
+        RenderBlock::addChild(newChild, beforeChild);
+    else
+        m_flowThread->addChild(newChild, beforeChild);
+}
+
 const char* RenderMultiColumnBlock::renderName() const
 {    
     if (isFloating())