Use etag for assignments/new

app/controllers/cards/assignments_controller.rb

@@ -2,6 +2,8 @@ class Cards::AssignmentsController < ApplicationController
   include CardScoped
 
   def new
+    @users = @collection.users.active.alphabetically
+    fresh_when @users
   end
 
   def create

app/views/cards/assignments/new.html.erb

@@ -7,13 +7,13 @@
 				navigable_list_actionable_items_value: true } do %>
     <strong class="popup__title">Assign this to…</strong>
 
-    <% if @collection.users.active.count > 1 %>
+    <% if @users.many? %>
 			<%= text_field_tag :search, nil, placeholder: "Filter…", class: "input input--transparent txt-small margin-block-half", autofocus: true,
 						type: "search", autocorrect: "off", autocomplete: "off", data: { "1p-ignore": "true", filter_target: "input", action: "input->filter#filter" } %>
     <% end %>
 
     <ul class="popup__list" data-filter-target="list">
-      <% @collection.users.active.alphabetically.each do |user| %>
+      <% @users.each do |user| %>
         <li class="popup__item" data-filter-target="item" data-navigable-list-target="item" aria-checked="<%= @card.assignees.include?(user) %>">
           <%= button_to card_assignments_path(@card, params: { assignee_id: user.id }), method: :post,
               class: "popup__btn btn",