pub fn add_new_unlabeled(&mut self) -> TagId {
        let next_id = self.normal.len() + 1; // tag id starts at 1
        self.add_new(next_id.to_string().as_str())
    }
Create a new tag with the provided layout, labelling it directly with its ID,
and append it to the list of normal tags.
The ID will be assigned automatically and returned.
leftwm-core/src/models/tag.rs