pub fn get_mut(&mut self, id: TagId) -> Option<&mut Tag> {
        if let Some(normal) = self.normal.get_mut(id - 1) {
            return Some(normal);
        }
        self.hidden
            .iter_mut()
            .find(|hidden_tag| hidden_tag.id == id)
    }
Get a tag by its ID as mutable
This method returns normal, as well as hidden tags.
leftwm-core/src/models/tag.rs