Make sure that we don't attempt to handle scrolling when the node is...

Make sure that we don't attempt to handle scrolling when the node is disconnected from the document. Fixes #7190.

src/offset.js

@@ -23,14 +23,17 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 
 		try {
 			box = elem.getBoundingClientRect();
+		} catch(e) {}
 
-		} catch(e) {
-			return { top: 0, left: 0 };
+		var doc = elem.ownerDocument,
+			docElem = doc.documentElement;
+
+		// Make sure we're not dealing with a disconnected DOM node
+		if ( !box || !jQuery.contains( docElem, elem ) ) {
+			return box || { top: 0, left: 0 };
 		}
 
-		var doc = elem.ownerDocument,
-			body = doc.body,
-			docElem = doc.documentElement,
+		var body = doc.body,
 			win = getWindow(doc),
 			clientTop  = docElem.clientTop  || body.clientTop  || 0,
 			clientLeft = docElem.clientLeft || body.clientLeft || 0,