### 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;
	size = p_size;
	_update_window_size();
}
Size2i Window::get_size() const {
	ERR_READ_THREAD_GUARD_V(Size2i());
	return size;
}
void Window::reset_size() {
	ERR_MAIN_THREAD_GUARD;
	set_size(Size2i());
}
Point2i Window::get_position_with_decorations() const {
	ERR_READ_THREAD_GUARD_V(Point2i());
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		return DisplayServer::get_singleton()->window_get_position_with_decorations(window_id);
	}
	return position;
}
Size2i Window::get_size_with_decorations() const {
	ERR_READ_THREAD_GUARD_V(Size2i());
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		return DisplayServer::get_singleton()->window_get_size_with_decorations(window_id);
	}
	return size;
}
Size2i Window::_clamp_limit_size(const Size2i &p_limit_size) {