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: edit.rb
    path of file: ./repos/gitlabhq/qa/qa/page/dashboard/snippet
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module QA
  module Page
    module Dashboard
      modul
    
          def fill_file_content(content, file_number = nil)
            if file_number
              within_element_by_index('file-holder-container', file_number - 1) do
                text_area.set(content)
              end
            else
              text_area.set(content)
            end