avm2: Implement XML.contains (#16206)

* avm2: XML.contains() implemented

* tests: XMLList known_failure removed

* avm2: XML manual checks removed

* avm2: XMLList.contains() behavior fixed

* avm2: XML contains method moved to xml.rs

* avm2: Empty line removed in xml.rs

* avm2: XML contains args name renamed to value

core/src/avm2/globals/XML.as

@@ -68,6 +68,7 @@ package {
         AS3 native function child(name:*):XMLList;
         AS3 native function childIndex():int;
         AS3 native function children():XMLList;
+        AS3 native function contains(value:*):Boolean;
         AS3 native function copy():XML;
         AS3 native function parent():*;
         AS3 native function elements(name:* = "*"):XMLList;
@@ -171,6 +172,11 @@ package {
             return self.AS3::children();
         };
 
+        prototype.contains = function(value:*):Boolean {
+            var self:XML = this;
+            return self.AS3::contains(value);
+        };
+
         prototype.copy = function():XML {
             var self:XML = this;
             return self.AS3::copy();

core/src/avm2/globals/xml.rs

@@ -336,6 +336,21 @@ pub fn children<'gc>(
     .into())
 }
 
+pub fn contains<'gc>(
+    _activation: &mut Activation<'_, 'gc>,
+    this: Object<'gc>,
+    args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error<'gc>> {
+    let xml = this.as_xml_object().unwrap();
+    let value = args.get_value(0);
+
+    if let Some(other) = value.as_object().and_then(|obj| obj.as_xml_object()) {
+        let result = xml.node().equals(&other.node());
+        return Ok(result.into());
+    }
+    Ok(false.into())
+}
+
 pub fn copy<'gc>(
     activation: &mut Activation<'_, 'gc>,
     this: Object<'gc>,

tests/tests/swfs/from_avmplus/e4x/XMLList/e13_5_1/test.toml

@@ -1,2 +1 @@
 num_ticks = 1
-known_failure = true