### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
ERR_MAIN_THREAD_GUARD;
	current_screen = p_screen;
	if (window_id == DisplayServer::INVALID_WINDOW_ID) {
		return;
	}
	DisplayServer::get_singleton()->window_set_current_screen(p_screen, window_id);
}
int Window::get_current_screen() const {
	ERR_READ_THREAD_GUARD_V(0);
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		current_screen = DisplayServer::get_singleton()->window_get_current_screen(window_id);
	}
	return current_screen;
}
void Window::set_position(const Point2i &p_position) {
	ERR_MAIN_THREAD_GUARD;
	position = p_position;
	if (embedder) {
		embedder->_sub_window_update(this);
	} else if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		DisplayServer::get_singleton()->window_set_position(p_position, window_id);
	}
}
Point2i Window::get_position() const {
	ERR_READ_THREAD_GUARD_V(Point2i());
	return position;
}
void Window::set_size(const Size2i &p_size) {