jQuery.fn.offset no longer returns ClientRect object for disconnected elements

Instead of returning box, which is a ClientRect, we take the top and left box
values and place them into a generic object.

src/offset.js

@@ -30,7 +30,7 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 
 		// Make sure we're not dealing with a disconnected DOM node
 		if ( !box || !jQuery.contains( docElem, elem ) ) {
-			return box || { top: 0, left: 0 };
+			return box ? { top: box.top, left: box.left } : { top: 0, left: 0 };
 		}
 
 		var body = doc.body,