Make paddingBoxRect less dumb.

sky/engine/core/rendering/RenderBox.h

Index: sky/engine/core/rendering/RenderBox.h
diff --git a/sky/engine/core/rendering/RenderBox.h b/sky/engine/core/rendering/RenderBox.h
index 4446622e158434ba253c9cf1e165bd6b1998d037..bfed6c7c4391702b5189c3ab6d4d06551ac97976 100644
--- a/sky/engine/core/rendering/RenderBox.h
+++ b/sky/engine/core/rendering/RenderBox.h
@@ -162,7 +162,7 @@ public:
     void setFrameRect(const LayoutRect& rect) { m_frameRect = rect; }
 
     LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); }
-    LayoutRect paddingBoxRect() const { return LayoutRect(borderLeft(), borderTop(), contentWidth() + paddingLeft() + paddingRight(), contentHeight() + paddingTop() + paddingBottom()); }
+    LayoutRect paddingBoxRect() const { return LayoutRect(borderLeft(), borderTop(), clientWidth(), clientHeight()); }
     IntRect pixelSnappedBorderBoxRect() const { return IntRect(IntPoint(), m_frameRect.pixelSnappedSize()); }
     virtual IntRect borderBoundingBox() const override final { return pixelSnappedBorderBoxRect(); }