### Godot version

4.1.1

### System information

linux

### Issue description

- When favoriting a path in a `FileDialog`, clicking on it travels to `path/to/dir/`.
- When going up a level from there, it doesn't go to `path/to` but to `path/to/dir` (without the `/`).

[simplescreenrecorder-2023-08-18_09.38.37.webm](https://github.com/godotengine/godot/assets/71937306/00c20ad3-292f-4961-84ed-dbc64906df52)

The problem is either (or both) that:
 - loaded path has a trailing `/`
 - parent dir of `stuff/` is considered to be `stuff`

### Steps to reproduce

favorite a directory and use the feature to navigate to it

### Minimal reproduction project

any (i.e. the project manager's "new project" dialog has one)
}
		}
		files.pop_front();
	}
	if (favorites->get_current() >= 0) {
		favorites->deselect(favorites->get_current());
	}
	favorite->set_pressed(false);
	fav_up->set_disabled(true);
	fav_down->set_disabled(true);
	get_ok_button()->set_disabled(_is_open_should_be_disabled());
	for (int i = 0; i < favorites->get_item_count(); i++) {
		if (favorites->get_item_metadata(i) == cdir || favorites->get_item_metadata(i) == cdir + "/") {
			favorites->select(i);
			favorite->set_pressed(true);
			if (i > 0) {
				fav_up->set_disabled(false);
			}
			if (i < favorites->get_item_count() - 1) {
				fav_down->set_disabled(false);
			}
			break;
		}
	}
}
void EditorFileDialog::_filter_selected(int) {
	update_file_name();
	update_file_list();
}
void EditorFileDialog::update_filters() {