avm2: Implement `TextField.alwaysShowSelection`

core/src/avm2/globals/flash/text/text_field.rs

@@ -53,20 +53,35 @@ pub fn text_field_allocator<'gc>(
 }
 
 pub fn get_always_show_selection<'gc>(
-    activation: &mut Activation<'_, 'gc>,
+    _activation: &mut Activation<'_, 'gc>,
-    _this: Object<'gc>,
+    this: Object<'gc>,
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
-    avm2_stub_getter!(activation, "flash.text.TextField", "alwaysShowSelection");
+    let Some(this) = this
-    Ok(Value::Bool(false))
+        .as_display_object()
+        .and_then(|this| this.as_edit_text())
+    else {
+        return Ok(Value::Undefined);
+    };
+
+    Ok(this.always_show_selection().into())
 }
 
 pub fn set_always_show_selection<'gc>(
     activation: &mut Activation<'_, 'gc>,
-    _this: Object<'gc>,
+    this: Object<'gc>,
-    _args: &[Value<'gc>],
+    args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
-    avm2_stub_setter!(activation, "flash.text.TextField", "alwaysShowSelection");
+    let Some(this) = this
+        .as_display_object()
+        .and_then(|this| this.as_edit_text())
+    else {
+        return Ok(Value::Undefined);
+    };
+
+    let value = args.get_bool(0);
+    this.set_always_show_selection(&mut activation.context, value);
+
     Ok(Value::Undefined)
 }