Don't always full invalidation on 'position' style change

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index 6c5d92e353290c20d657bea682c58708ef1468f8..cee0f894f8a154893302580c023b6a008b47f441 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -543,7 +543,6 @@ bool RenderStyle::diffNeedsFullLayoutAndPaintInvalidation(const RenderStyle& oth
         || noninherited_flags.overflowY != other.noninherited_flags.overflowY
         || noninherited_flags.clear != other.noninherited_flags.clear
         || noninherited_flags.unicodeBidi != other.noninherited_flags.unicodeBidi
-        || noninherited_flags.position != other.noninherited_flags.position
         || noninherited_flags.floating != other.noninherited_flags.floating
         || noninherited_flags.originalDisplay != other.noninherited_flags.originalDisplay)
         return true;
@@ -604,7 +603,8 @@ bool RenderStyle::diffNeedsFullLayout(const RenderStyle& other) const
             return true;
     }
 
-    if (noninherited_flags.verticalAlign != other.noninherited_flags.verticalAlign)
+    if (noninherited_flags.verticalAlign != other.noninherited_flags.verticalAlign
+        || noninherited_flags.position != other.noninherited_flags.position)
         return true;
 
     if (surround.get() != other.surround.get()) {