FIX: Display new DM button when public channels are disabled (#28306)

plugins/chat/spec/system/list_channels/no_sidebar_spec.rb

@@ -123,4 +123,25 @@ RSpec.describe "List channels | no sidebar", type: :system do
       expect(page).to have_no_css(".direct-message-channels-section")
     end
   end
+
+  context "when public channels are disabled" do
+    before { SiteSetting.enable_public_channels = false }
+
+    it "shows the create direct message button" do
+      visit("/chat")
+
+      expect(chat).to have_direct_message_channels_section
+    end
+
+    context "with drawer prefered" do
+      before { chat.prefers_drawer }
+
+      it "shows the create direct message button in the drawer" do
+        visit("/")
+        chat.open_from_header
+
+        expect(PageObjects::Pages::ChatDrawer.new).to have_direct_message_channels_section
+      end
+    end
+  end
 end

plugins/chat/spec/system/page_objects/chat/chat.rb

@@ -134,6 +134,10 @@ module PageObjects
         have_selector(".channel-list-empty-message")
       end
 
+      def has_direct_message_channels_section?
+        has_css?(".direct-message-channels-section")
+      end
+
       private
 
       def drawer?(expectation:, channel_id: nil, expanded: true)

plugins/chat/spec/system/page_objects/chat_drawer/chat_drawer.rb

@@ -145,6 +145,10 @@ module PageObjects
         has_no_css?("#{thread_list_button_selector}.has-unreads")
       end
 
+      def has_direct_message_channels_section?
+        has_css?(".direct-message-channels-section")
+      end
+
       private
 
       def mouseout