core: Add `DisplayObject` method for setting the AVM2 side of a display object

core/src/display_object.rs

@@ -1,7 +1,9 @@
 use crate::avm1::{
     Error as Avm1Error, Object as Avm1Object, TObject as Avm1TObject, Value as Avm1Value,
 };
-use crate::avm2::{Avm2, Event as Avm2Event, TObject as Avm2TObject, Value as Avm2Value};
+use crate::avm2::{
+    Avm2, Event as Avm2Event, Object as Avm2Object, TObject as Avm2TObject, Value as Avm2Value,
+};
 use crate::context::{RenderContext, UpdateContext};
 use crate::drawing::Drawing;
 use crate::player::NEWEST_PLAYER_VERSION;
@@ -1072,6 +1074,8 @@ pub trait TDisplayObject<'gc>:
         Avm2Value::Undefined // todo: see above
     }
 
+    fn set_object2(&mut self, _mc: MutationContext<'gc, '_>, _to: Avm2Object<'gc>) {}
+
     /// Tests if a given stage position point intersects with the world bounds of this object.
     fn hit_test_bounds(&self, pos: (Twips, Twips)) -> bool {
         self.world_bounds().contains(pos)

core/src/display_object/edit_text.rs

@@ -1401,6 +1401,10 @@ impl<'gc> TDisplayObject<'gc> for EditText<'gc> {
             .unwrap_or(Avm2Value::Undefined)
     }
 
+    fn set_object2(&mut self, mc: MutationContext<'gc, '_>, to: Avm2Object<'gc>) {
+        self.0.write(mc).object = Some(to.into());
+    }
+
     fn self_bounds(&self) -> BoundingBox {
         self.0.read().bounds.clone()
     }

core/src/display_object/graphic.rs

@@ -209,6 +209,10 @@ impl<'gc> TDisplayObject<'gc> for Graphic<'gc> {
             .unwrap_or(Avm2Value::Undefined)
     }
 
+    fn set_object2(&mut self, mc: MutationContext<'gc, '_>, to: Avm2Object<'gc>) {
+        self.0.write(mc).avm2_object = Some(to);
+    }
+
     fn as_drawing(&self, gc_context: MutationContext<'gc, '_>) -> Option<RefMut<'_, Drawing>> {
         let mut write = self.0.write(gc_context);
         if write.drawing.is_none() {

core/src/display_object/movie_clip.rs

@@ -2064,6 +2064,10 @@ impl<'gc> TDisplayObject<'gc> for MovieClip<'gc> {
             .unwrap_or(Avm2Value::Undefined)
     }
 
+    fn set_object2(&mut self, mc: MutationContext<'gc, '_>, to: Avm2Object<'gc>) {
+        self.0.write(mc).object = Some(to.into());
+    }
+
     fn unload(&self, context: &mut UpdateContext<'_, 'gc, '_>) {
         for child in self.iter_execution_list() {
             child.unload(context);

core/src/display_object/video.rs

@@ -424,4 +424,8 @@ impl<'gc> TDisplayObject<'gc> for Video<'gc> {
 
         context.transform_stack.pop();
     }
+
+    fn set_object2(&mut self, mc: MutationContext<'gc, '_>, to: Avm2Object<'gc>) {
+        self.0.write(mc).object = Some(to.into());
+    }
 }