Disentangle repaint-after-compositing from updateLayerPositionsAfterLayout

Source/core/rendering/RenderInline.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 1547 matching lines @@
     region.bounds.setY(absPos.y() + region.bounds.y());
 
     regions.append(region);
 }
 
 void RenderInline::invalidateTreeIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
     bool establishesNewPaintInvalidationContainer = isPaintInvalidationContainer();
     const RenderLayerModelObject& newPaintInvalidationContainer = *adjustCompositedContainerForSpecialAncestors(establishesNewPaintInvalidationContainer ? this : &paintInvalidationState.paintInvalidationContainer());
     PaintInvalidationState childPaintInvalidationState(paintInvalidationState, *this, newPaintInvalidationContainer);
+
+    if (isRelPositioned()) {
+        const LayoutPoint oldPosition = previousPositionFromPaintInvalidationContainer();
+        const LayoutPoint newPosition = RenderLayer::positionFromPaintInvalidationContainer(this, &newPaintInvalidationContainer, &paintInvalidationState);
+        if (oldPosition != newPosition)
+            childPaintInvalidationState.setForceCheckForPaintInvalidation();
+    }
+
     RenderObject::invalidateTreeIfNeeded(childPaintInvalidationState);
 }
 
 } // namespace blink