FIX: allows an admin to access users preferences (#19559)

plugins/chat/assets/javascripts/discourse/connectors/user-preferences-nav/preferences-chat-link.hbs

@@ -1,4 +1,4 @@
-{{#if this.model.can_chat}}
+{{#if (or this.model.can_chat this.model.admin)}}
   <LinkTo @route="preferences.chat">
     {{i18n "chat.title_capitalized"}}
   </LinkTo>

plugins/chat/assets/javascripts/discourse/routes/preferences-chat.js

@@ -8,7 +8,7 @@ export default class PreferencesChatRoute extends RestrictedUserRoute {
   showFooter = true;
 
   setupController(controller, user) {
-    if (!user?.can_chat) {
+    if (!user?.can_chat && !user.admin) {
       return this.transitionTo(`discovery.${defaultHomepage()}`);
     }
     controller.set("model", user);

plugins/chat/spec/system/user_chat_preferences_spec.rb

@@ -31,4 +31,18 @@ RSpec.describe "User chat preferences", type: :system, js: true do
 
     expect(page).to have_css("#user_chat_sounds .select-kit-header[data-value='bell']")
   end
+
+  context "as an admin on another user's preferences" do
+    fab!(:current_user) { Fabricate(:admin) }
+    fab!(:user_1) { Fabricate(:admin) }
+
+    before { sign_in(current_user) }
+
+    it "allows to change settings" do
+      visit("/u/#{user_1.username}/preferences")
+      find(".preferences-chat-link").click
+
+      expect(page).to have_current_path("/u/#{user_1.username}/preferences/chat")
+    end
+  end
 end