avm2: Support matrix3D in transform copy

reference: https://docs.ruffle.rs/en_US/FlashPlatform/reference/actionscript/3/flash/display/DisplayObject.html#transform

core/src/avm2/globals/flash/display/display_object.rs

@@ -4,6 +4,7 @@ use crate::avm2::activation::Activation;
 use crate::avm2::error::{illegal_operation_error, make_error_2007, make_error_2008};
 use crate::avm2::filters::FilterAvm2Ext;
 use crate::avm2::globals::flash::geom::transform::color_transform_from_transform_object;
+use crate::avm2::globals::flash::geom::transform::has_matrix3d_from_transform_object;
 use crate::avm2::globals::flash::geom::transform::matrix_from_transform_object;
 use crate::avm2::globals::slots::flash_display_shader as shader_slots;
 use crate::avm2::globals::slots::flash_geom_point as point_slots;
@@ -755,14 +756,15 @@ pub fn set_transform<'gc>(
 ) -> Result<Value<'gc>, Error<'gc>> {
     let transform = args.get_object(activation, 0, "transform")?;
 
-    // FIXME - consider 3D matrix and pixel bounds
+    // FIXME - consider pixel bounds
     let matrix = matrix_from_transform_object(transform);
-
+    let has_matrix3d = has_matrix3d_from_transform_object(transform);
     let color_transform = color_transform_from_transform_object(transform);
 
     let dobj = this.as_display_object().unwrap();
     let mut write = dobj.base_mut(activation.context.gc_context);
     write.set_matrix(matrix);
+    write.set_has_matrix3d_stub(has_matrix3d);
     write.set_color_transform(color_transform);
     drop(write);
     if let Some(parent) = dobj.parent() {

core/src/avm2/globals/flash/geom/transform.rs

@@ -119,6 +119,12 @@ pub fn get_concatenated_matrix<'gc>(
     }
 }
 
+pub fn has_matrix3d_from_transform_object(transform_object: Object<'_>) -> bool {
+    get_display_object(transform_object)
+        .base()
+        .has_matrix3d_stub()
+}
+
 pub fn matrix_from_transform_object(transform_object: Object<'_>) -> Matrix {
     *get_display_object(transform_object).base().matrix()
 }