Merge 142922

Source/WebCore/rendering/RenderBlock.cpp

Index: Source/WebCore/rendering/RenderBlock.cpp
===================================================================
--- Source/WebCore/rendering/RenderBlock.cpp	(revision 143502)
+++ Source/WebCore/rendering/RenderBlock.cpp	(working copy)
@@ -118,7 +118,7 @@
 static int gDelayUpdateScrollInfo = 0;
 static DelayedUpdateScrollInfoSet* gDelayedUpdateScrollInfoSet = 0;
 
-static bool gIsInColumnFlowSplit = false;
+static bool gColumnFlowSplitEnabled = true;
 
 bool RenderBlock::s_canPropagateFloatIntoSibling = false;
 
@@ -832,10 +832,10 @@
         beforeChild = beforeChild->nextSibling();
 
     // Check for a spanning element in columns.
-    if (!gIsInColumnFlowSplit) {
+    if (gColumnFlowSplitEnabled) {
         RenderBlock* columnsBlockAncestor = columnsBlockForSpanningElement(newChild);
         if (columnsBlockAncestor) {
-            TemporaryChange<bool> isInColumnFlowSplit(gIsInColumnFlowSplit, true);
+            TemporaryChange<bool> columnFlowSplitEnabled(gColumnFlowSplitEnabled, false);
             // We are placing a column-span element inside a block.
             RenderBlock* newBox = createAnonymousColumnSpanBlock();
         
@@ -1143,6 +1143,9 @@
         return;
     }
 
+    // This protects against column split flows when anonymous blocks are getting merged.
+    TemporaryChange<bool> columnFlowSplitEnabled(gColumnFlowSplitEnabled, false);
+
     // If this child is a block, and if our previous and next siblings are
     // both anonymous blocks with inline content, then we can go ahead and
     // fold the inline content back together.