### 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;
	title = p_title;
	if (embedder) {
		embedder->_sub_window_update(this);
	} else if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		String tr_title = atr(p_title);
#ifdef DEBUG_ENABLED
		if (window_id == DisplayServer::MAIN_WINDOW_ID) {
			
			
			
			tr_title = vformat("%s (DEBUG)", tr_title);
		}
#endif
		DisplayServer::get_singleton()->window_set_title(tr_title, window_id);
	}
}
String Window::get_title() const {