### 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.
}
				}
			}
			if (transient) {
				_make_transient();
			}
			if (visible) {
				notification(NOTIFICATION_VISIBILITY_CHANGED);
				emit_signal(SceneStringNames::get_singleton()->visibility_changed);
				RS::get_singleton()->viewport_set_active(get_viewport_rid(), true);
			}
#ifdef TOOLS_ENABLED
			if (is_part_of_edited_scene()) {
				
				set_message_translation(false);
				notification(NOTIFICATION_TRANSLATION_CHANGED);
			}
#endif
			notification(NOTIFICATION_THEME_CHANGED);
		} break;
		case NOTIFICATION_READY: {
			if (wrap_controls) {
				
				_update_child_controls();
			}
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			emit_signal(SceneStringNames::get_singleton()->theme_changed);
			_invalidate_theme_cache();
			_update_theme_item_cache();