You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: slot.rb
    path of file: ./repos/shoes4/shoes-core/lib/shoes
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class Shoes
  class Slot < Common::UIElement
    include Co
    
    def contents_alignment(_ = nil)
      position_contents
      update_child_visibility

      # Layout code expects height returned!
      determine_slot_height
    end