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

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index 280a5a89f94ad814b2969eb38bd2fffb49cd4184..5058b0ab5bc436898d1344e4c6cadddf488dbc4d 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -31,7 +31,6 @@
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/LayoutRectRecorder.h"
 #include "core/rendering/RenderBlock.h"
-#include "core/rendering/RenderFlowThread.h"
 #include "core/rendering/RenderFullScreen.h"
 #include "core/rendering/RenderGeometryMap.h"
 #include "core/rendering/RenderLayer.h"
@@ -210,14 +209,12 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
     RenderStyle* parentStyle = parent()->style();
     RenderInline* parentRenderInline = parent()->isRenderInline() ? toRenderInline(parent()) : 0;
     bool checkFonts = document().inNoQuirksMode();
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
     bool alwaysCreateLineBoxes = (parentRenderInline && parentRenderInline->alwaysCreateLineBoxes())
         || (parentRenderInline && parentStyle->verticalAlign() != BASELINE)
         || style()->verticalAlign() != BASELINE
         || style()->textEmphasisMark() != TextEmphasisMarkNone
         || (checkFonts && (!parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(style()->font().fontMetrics())
-        || parentStyle->lineHeight() != style()->lineHeight()))
-        || (flowThread && flowThread->hasRegionsWithStyling());
+            || parentStyle->lineHeight() != style()->lineHeight()));
 
     if (!alwaysCreateLineBoxes && checkFonts && document().styleEngine()->usesFirstLineRules()) {
         // Have to check the first line style as well.
@@ -334,7 +331,6 @@ RenderInline* RenderInline::clone() const
 {
     RenderInline* cloneInline = new RenderInline(node());
     cloneInline->setStyle(style());
-    cloneInline->setFlowThreadState(flowThreadState());
     return cloneInline;
 }
 
@@ -1133,8 +1129,7 @@ LayoutSize RenderInline::offsetFromContainer(RenderObject* container, const Layo
 
     if (offsetDependsOnPoint) {
         *offsetDependsOnPoint = container->hasColumns()
-            || (container->isBox() && container->style()->isFlippedBlocksWritingMode())
-            || container->isRenderFlowThread();
+            || (container->isBox() && container->style()->isFlippedBlocksWritingMode());
     }
 
     return offset;