Copy button doesn't work in popup menu ATextArea

### One More Step Before opening this issue

- [x] To follow our [Code of Conduct](https://github.com/aui-framework/aui/blob/master/CODE_OF_CONDUCT.md)
- [x] I've considered [existing issues on GitHub page](https://github.com/aui-framework/aui/issues) and didn't find a similar issue

### What happened?

### Relevant log output or stack trace

```shell

```

### Steps to reproduce

```bash
1. Open `aui.example.views`
2. Click on ATextArea
3. Click "Copy"
4. See error
```

### Affected Platforms

_No response_

### Link to build, i.e. failing GitHub Action job (if any).

_No response_