servo: Merge #4030 - Stop including the element during Element.getEle…

…mentsByClassName (from achals:master); r=Ms2ger

servo/servo#3995

This is my first PR, so please let me know if I'm doing something wrong!

Source-Repo: https://github.com/servo/servo
Source-Revision: 8cecb03d756d8df4de69ca13b663d547f438d320

UltraBlame original commit: 6cee2c8e7db780d1d4114d0aa3d2d055a36863d6

servo/components/script/dom/htmlcollection.rs

@@ -140,8 +140,8 @@ impl HTMLCollection {
             classes: Vec<Atom>
         }
         impl CollectionFilter for ClassNameFilter {
-            fn filter(&self, elem: JSRef<Element>, _root: JSRef<Node>) -> bool {
-                self.classes.iter().all(|class| elem.has_class(class))
+            fn filter(&self, elem: JSRef<Element>, root: JSRef<Node>) -> bool {
+                (NodeCast::from_ref(elem) != root) && self.classes.iter().all(|class| elem.has_class(class))
             }
         }
         let filter = ClassNameFilter {