app/helpers/gitlab/nav_helper.rb


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module Gitlab
  module NavHelper
    def nav_menu_collapsed?
      cookies[:collapsed_nav] == 'true'
    end

    def nav_sidebar_class
      if nav_menu_collapsed?
        "page-sidebar-collapsed"
      else
        "page-sidebar-expanded"
      end
    end

    def nav_header_class
      if nav_menu_collapsed?
        "header-collapsed"
      else
        "header-expanded"
      end
    end
  end
end