anchor.diff:      </a>
       <ul id='tag-filter-dropdown' class='dropdown-content'>
         <li>
  -        <%= link_to polymorphic_path(content_type), class: "#{content_type.color}-text" do %>
  +        <%= link_to params.permit(:tag, :favorite_only).merge({ tag: nil }), class: "#{content_type.color}-text" do %>
             <i class="material-icons">loyalty</i>
             All <%= content_type.name.downcase.pluralize %>
           <% end %>
  
positive.code: 
    <% if content_type.new.respond_to?(:favorite?) %>
      <a class='btn white <%= 'yellow lighten-3' if params.key?(:favorite_only) %> black-text tooltipped'
          href="<%= url_for(params.permit(:universe, :favorite_only).merge({favorite_only: params.key?(:favorite_only) ? nil : 1})) %>"
          data-position="bottom"
          data-delay="500"
          data-tooltip="Filter by favorite">
  
negative.code:       <% if @page_tags %>
          <% @page_tags.each do |page_tag| %>
            <li>
              <%= link_to params.permit(:tag, :favorite_only).merge({ tag: PageTagService.slug_for(page_tag.tag) }), class: "#{content_type.color}-text" do %>
                <i class="material-icons">loyalty</i>
                <small class="grey-text">tagged</small>
                <%= page_tag.tag %>
  