avm2: Ignore errors when setting properties in amf deserializer

Flash Player *traces* any errors that occur during setting properties
on the newly-constructed object durting AMf deserialization, and
continues deserializing.

core/src/avm2/amf.rs

@@ -339,12 +339,27 @@ pub fn deserialize_value<'gc>(
             let obj = target_class.construct(activation, &[])?;
 
             for entry in elements {
+                let name = entry.name();
                 let value = deserialize_value(activation, entry.value())?;
-                obj.set_public_property(
-                    AvmString::new_utf8(activation.context.gc_context, entry.name()),
+                // Flash player logs the error and continues deserializing the rest of the object,
+                // even when calling a customer setter
+                if let Err(e) = obj.set_public_property(
+                    AvmString::new_utf8(activation.context.gc_context, name),
                     value,
                     activation,
-                )?;
+                ) {
+                    tracing::warn!(
+                        "Ignoring error deserializing AMF property for field {name:?}: {e:?}"
+                    );
+                    if let Error::AvmError(e) = e {
+                        if let Some(e) = e.as_object().and_then(|o| o.as_error_object()) {
+                            // Flash player *traces* the error (without a stacktrace)
+                            activation.context.avm_trace(
+                                &e.display().expect("Failed to display error").to_string(),
+                            );
+                        }
+                    }
+                }
             }
             obj.into()
         }

tests/tests/swfs/avm2/amf_missing_prop/Test.as

@@ -0,0 +1,61 @@
+package  {
+
+	import flash.display.MovieClip;
+
+
+	public class Test extends MovieClip {
+
+
+		public function Test() {
+		}
+	}
+
+}
+
+import flash.utils.ByteArray;
+import flash.net.registerClassAlias;
+import flash.net.getClassByAlias;
+import flash.net.ObjectEncoding;
+
+
+class MyFirstClass {
+	public var myProp: String;
+	public var myOtherProp: String;
+	public var oneGoodProp: String;
+	public function MyFirstClass(val: String) {
+		this.myProp = val;
+		this.myOtherProp = "My other val";
+		this.oneGoodProp = "The one good prop";
+	}
+}
+
+class MySecondClass {
+	public function set myOtherProp(newVal: String) {
+		trace("Called setter with: " + newVal);
+		throw new Error("Called myOtherProp setter with " + newVal);
+	}
+
+	public var oneGoodProp:String;
+
+	public function toString(): String {
+		return "MySecondClass(oneGoodProp = " + this.oneGoodProp + ")";
+	}
+}
+
+function doRoundTrip(version: int) {
+	trace("Roundtrip with AMF version: " + version);
+	var bytes = new ByteArray();
+	bytes.objectEncoding = version;
+	registerClassAlias("MyClass", MyFirstClass);
+	bytes.writeObject(new MyFirstClass("My value"));
+	bytes.position = 0;
+	registerClassAlias("MyClass", MySecondClass);
+	trace("Current alias: " + getClassByAlias("MyClass"));
+	var roundtrip = bytes.readObject();
+	trace("Deserialized: " + roundtrip);
+}
+
+// FIXME - Ruffle AMF0 class serialization is broken
+//doRoundTrip(ObjectEncoding.AMF0);
+trace();
+doRoundTrip(ObjectEncoding.AMF3);

tests/tests/swfs/avm2/amf_missing_prop/output.txt

@@ -0,0 +1,7 @@
+
+Roundtrip with AMF version: 3
+Current alias: [class MySecondClass]
+Called setter with: My other val
+Error: Called myOtherProp setter with My other val
+ReferenceError: Error #1056: Cannot create property myProp on Test.as$0.MySecondClass.
+Deserialized: MySecondClass(oneGoodProp = The one good prop)

tests/tests/swfs/avm2/amf_missing_prop/test.toml

@@ -0,0 +1 @@
+num_ticks = 1