Don't repaint when setting border or outline 0 with style none

Source/core/rendering/style/BorderValue.h

Index: Source/core/rendering/style/BorderValue.h
diff --git a/Source/core/rendering/style/BorderValue.h b/Source/core/rendering/style/BorderValue.h
index 87031329ff472149af9bd2e771693cede137cf44..211f0be97f9987f51ece16e78d171e3319bf776a 100644
--- a/Source/core/rendering/style/BorderValue.h
+++ b/Source/core/rendering/style/BorderValue.h
@@ -63,6 +63,16 @@ public:
         return m_width == o.m_width && m_style == o.m_style && m_color == o.m_color && m_colorIsCurrentColor == o.m_colorIsCurrentColor;
     }
 
+    // The default width is 3px, but if the style is none we compute a value of 0 (in RenderStyle itself)
+    bool visuallyEqual(const BorderValue& o) const
+    {
+        if (m_style == BNONE && o.m_style == BNONE)
+            return true;
+        if (m_style == BHIDDEN && o.m_style == BHIDDEN)
+            return true;
+        return *this == o;
+    }
+
     bool operator!=(const BorderValue& o) const
     {
         return !(*this == o);