*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/RenderGrid.cpp

Index: Source/core/rendering/RenderGrid.cpp
diff --git a/Source/core/rendering/RenderGrid.cpp b/Source/core/rendering/RenderGrid.cpp
index 36fb8e077ab2fdc938b484214339807b3d9f0225..45b19b122a8259c0332a08bde6fa2bdc813eba99 100644
--- a/Source/core/rendering/RenderGrid.cpp
+++ b/Source/core/rendering/RenderGrid.cpp
@@ -259,14 +259,6 @@ void RenderGrid::layoutBlock(bool relayoutChildren)
     // It would be nice to refactor some of the duplicate code.
     LayoutRepainter repainter(*this, checkForRepaintDuringLayout());
     LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode());
-
-    // Regions changing widths can force us to relayout our children.
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
-    if (logicalWidthChangedInRegions(flowThread))
-        relayoutChildren = true;
-    if (updateRegionsAndShapesLogicalSize(flowThread))
-        relayoutChildren = true;
-
     LayoutSize previousSize = size();
 
     setLogicalHeight(0);
@@ -282,8 +274,6 @@ void RenderGrid::layoutBlock(bool relayoutChildren)
 
     layoutPositionedObjects(relayoutChildren || isRoot());
 
-    computeRegionRangeForBlock(flowThread);
-
     computeOverflow(oldClientAfterEdge);
     statePusher.pop();