Merge 106694

Source/WebCore/rendering/RenderFlexibleBox.cpp

Index: Source/WebCore/rendering/RenderFlexibleBox.cpp
===================================================================
--- Source/WebCore/rendering/RenderFlexibleBox.cpp	(revision 107302)
+++ Source/WebCore/rendering/RenderFlexibleBox.cpp	(working copy)
@@ -166,6 +166,13 @@
     LayoutRepainter repainter(*this, checkForRepaintDuringLayout());
     LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode());
 
+    if (inRenderFlowThread()) {
+        // Regions changing widths can force us to relayout our children.
+        if (logicalWidthChangedInRegions())
+            relayoutChildren = true;
+    }
+    computeInitialRegionRangeForBlock();
+
     IntSize previousSize = size();
 
     setLogicalHeight(0);
@@ -193,6 +200,8 @@
 
     layoutPositionedObjects(relayoutChildren || isRoot());
 
+    computeRegionRangeForBlock();
+
     // FIXME: css3/flexbox/repaint-rtl-column.html seems to repaint more overflow than it needs to.
     computeOverflow(oldClientAfterEdge);
     statePusher.pop();