### 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 (get_editor_data().get_edited_scene_root()) {
		if (get_editor_data().get_edited_scene_root()->get_parent() == scene_root) {
			scene_root->remove_child(get_editor_data().get_edited_scene_root());
		}
	}
	get_editor_data().set_edited_scene_root(p_scene);
	if (Object::cast_to<Popup>(p_scene)) {
		Object::cast_to<Popup>(p_scene)->show();
	}
	SceneTreeDock::get_singleton()->set_edited_scene(p_scene);
	if (get_tree()) {
		get_tree()->set_edited_scene_root(p_scene);
	}
	if (p_scene) {
		if (p_scene->get_parent() != scene_root) {
			scene_root->add_child(p_scene, true);
		}
	}
}
int EditorNode::_get_current_main_editor() {
	for (int i = 0; i < editor_table.size(); i++) {
		if (editor_table[i] == editor_plugin_screen) {
			return i;
		}
	}
	return 0;
}
Dictionary EditorNode::_get_main_scene_state() {