[New Multicolumn] Stay out of the old multicol machinery for column-span:all.

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 87e0beedb05291c078147aa406c6a8ed9d16d69e..c0dc7a6c76becd0002dbfade559e60d12c3e10e5 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -789,7 +789,7 @@ void RenderBlock::addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild,
     }
 
     // Check for a spanning element in columns.
-    if (gColumnFlowSplitEnabled) {
+    if (gColumnFlowSplitEnabled && !document().regionBasedColumnsEnabled()) {
         RenderBlockFlow* columnsBlockAncestor = columnsBlockForSpanningElement(newChild);
         if (columnsBlockAncestor) {
             TemporaryChange<bool> columnFlowSplitEnabled(gColumnFlowSplitEnabled, false);