Let padding change always trigger layout and full paint invalidation

third_party/WebKit/Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 620 matching lines @@
   //   layout change instead of forced full paint invalidation.
 
   if (m_surround.get() != other.m_surround.get()) {
     // If our border widths change, then we need to layout. Other changes to
     // borders only necessitate a paint invalidation.
     if (borderLeftWidth() != other.borderLeftWidth() ||
         borderTopWidth() != other.borderTopWidth() ||
         borderBottomWidth() != other.borderBottomWidth() ||
         borderRightWidth() != other.borderRightWidth())
       return true;
+
+    if (m_surround->padding != other.m_surround->padding)
+      return true;
   }
 
   if (m_rareNonInheritedData.get() != other.m_rareNonInheritedData.get()) {
     if (m_rareNonInheritedData->m_appearance !=
             other.m_rareNonInheritedData->m_appearance ||
         m_rareNonInheritedData->marginBeforeCollapse !=
             other.m_rareNonInheritedData->marginBeforeCollapse ||
         m_rareNonInheritedData->marginAfterCollapse !=
             other.m_rareNonInheritedData->marginAfterCollapse ||
         m_rareNonInheritedData->lineClamp !=
@@ skipping 224 matching lines @@
 
     if (m_box->boxSizing() != other.m_box->boxSizing())
       return true;
   }
 
   if (m_nonInheritedData.m_verticalAlign !=
           other.m_nonInheritedData.m_verticalAlign ||
       position() != other.position())
     return true;
 
-  if (m_surround.get() != other.m_surround.get()) {
-    if (m_surround->padding != other.m_surround->padding)
-      return true;
-  }
-
   if (m_rareNonInheritedData.get() != other.m_rareNonInheritedData.get()) {
     if (m_rareNonInheritedData->m_alignContent !=
             other.m_rareNonInheritedData->m_alignContent ||
         m_rareNonInheritedData->m_alignItems !=
             other.m_rareNonInheritedData->m_alignItems ||
         m_rareNonInheritedData->m_alignSelf !=
             other.m_rareNonInheritedData->m_alignSelf ||
         m_rareNonInheritedData->m_justifyContent !=
             other.m_rareNonInheritedData->m_justifyContent ||
         m_rareNonInheritedData->m_justifyItems !=
@@ skipping 1571 matching lines @@
     if (value < 0)
       fvalue -= 0.5f;
     else
       fvalue += 0.5f;
   }
 
   return roundForImpreciseConversion<int>(fvalue / zoomFactor);
 }
 
 }  // namespace blink