Add mutations observer to initialize user initials added through ajax

app/assets/javascripts/users.js

@@ -2,7 +2,14 @@
   "use strict";
   App.Users = {
     initialize: function() {
+      var observer;
       $(".initialjs-avatar").initial();
+      observer = new MutationObserver(function(mutations) {
+        $.each(mutations, function(index, mutation) {
+          $(mutation.addedNodes).find(".initialjs-avatar").initial();
+        });
+      });
+      observer.observe(document.body, { childList: true, subtree: true });
     }
   };
 }).call(this);

spec/system/users_spec.rb

@@ -515,4 +515,18 @@ describe "Users" do
       end
     end
   end
+
+  describe "Initials" do
+    scenario "display SVG avatars when loaded into the DOM", :js do
+      login_as(create(:user))
+      visit debate_path(create(:debate))
+
+      fill_in "Leave your comment", with: "I'm awesome"
+      click_button "Publish comment"
+
+      within ".comment", text: "I'm awesome" do
+        expect(page).to have_css "img.initialjs-avatar[src^='data:image/svg']"
+      end
+    end
+  end
 end