[css-grid] Only force full invalidation when grid item data change

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 577 matching lines @@
     }
 
     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 != other.m_rareNonInheritedData->lineClamp
             || m_rareNonInheritedData->textOverflow != other.m_rareNonInheritedData->textOverflow
             || m_rareNonInheritedData->m_shapeMargin != other.m_rareNonInheritedData->m_shapeMargin
             || m_rareNonInheritedData->m_order != other.m_rareNonInheritedData->m_order
-            || m_rareNonInheritedData->m_grid.get() != other.m_rareNonInheritedData->m_grid.get()
-            || m_rareNonInheritedData->m_gridItem.get() != other.m_rareNonInheritedData->m_gridItem.get()
             || m_rareNonInheritedData->hasFilters() != other.m_rareNonInheritedData->hasFilters())
             return true;
 
+        if (m_rareNonInheritedData->m_grid.get() != other.m_rareNonInheritedData->m_grid.get()
+            && *m_rareNonInheritedData->m_grid.get() != *other.m_rareNonInheritedData->m_grid.get())
+            return true;
+
+        if (m_rareNonInheritedData->m_gridItem.get() != other.m_rareNonInheritedData->m_gridItem.get()
+            && *m_rareNonInheritedData->m_gridItem.get() != *other.m_rareNonInheritedData->m_gridItem.get())
+            return true;
+
         if (m_rareNonInheritedData->m_deprecatedFlexibleBox.get() != other.m_rareNonInheritedData->m_deprecatedFlexibleBox.get()
             && *m_rareNonInheritedData->m_deprecatedFlexibleBox.get() != *other.m_rareNonInheritedData->m_deprecatedFlexibleBox.get())
             return true;
 
         if (m_rareNonInheritedData->m_flexibleBox.get() != other.m_rareNonInheritedData->m_flexibleBox.get()
             && *m_rareNonInheritedData->m_flexibleBox.get() != *other.m_rareNonInheritedData->m_flexibleBox.get())
             return true;
 
         if (m_rareNonInheritedData->m_multiCol.get() != other.m_rareNonInheritedData->m_multiCol.get()
             && *m_rareNonInheritedData->m_multiCol.get() != *other.m_rareNonInheritedData->m_multiCol.get())
@@ skipping 1409 matching lines @@
         if (value < 0)
             fvalue -= 0.5f;
         else
             fvalue += 0.5f;
     }
 
     return roundForImpreciseConversion<int>(fvalue / zoomFactor);
 }
 
 } // namespace blink