FIX: Save previous chat state when navigating with the sidebar (#25537)

plugins/chat/assets/javascripts/discourse/initializers/chat-sidebar.js

@@ -29,13 +29,18 @@ export default {
     this.currentUser = container.lookup("service:current-user");
 
     withPluginApi("1.8.0", (api) => {
+      const chatStateManager = container.lookup("service:chat-state-manager");
+
       api.addSidebarPanel(
         (BaseCustomSidebarPanel) =>
           class ChatSidebarPanel extends BaseCustomSidebarPanel {
             key = CHAT_PANEL;
             switchButtonLabel = I18n.t("sidebar.panels.chat.label");
             switchButtonIcon = "d-chat";
-            switchButtonDefaultUrl = getURL("/chat");
+
+            get switchButtonDefaultUrl() {
+              return getURL(chatStateManager.lastKnownChatURL || "/chat");
+            }
           }
       );
 

plugins/chat/spec/system/navigation_spec.rb

@@ -435,7 +435,7 @@ RSpec.describe "Navigation", type: :system do
         thread.add(current_user)
       end
 
-      it "correctly closes the panel" do
+      it "correctly shows the thread panel" do
         chat_page.visit_thread(thread)
 
         expect(side_panel_page).to have_open_thread(thread)
@@ -443,7 +443,7 @@ RSpec.describe "Navigation", type: :system do
         find("#site-logo").click
         sidebar_component.switch_to_chat
 
-        expect(page).to have_no_css(".chat-side-panel")
+        expect(side_panel_page).to have_open_thread(thread)
       end
     end
   end

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

@@ -27,6 +27,10 @@ module PageObjects
         find(".chat-header-icon").click
       end
 
+      def close_from_header
+        find(".chat-header-icon").click
+      end
+
       def has_header_href?(href)
         find(".chat-header-icon").has_link?(href: href)
       end

plugins/chat/spec/system/separate_sidebar_mode_spec.rb

@@ -9,10 +9,12 @@ RSpec.describe "Separate sidebar mode", type: :system do
 
   fab!(:current_user) { Fabricate(:user) }
   fab!(:channel_1) { Fabricate(:chat_channel) }
+  fab!(:channel_2) { Fabricate(:chat_channel) }
 
   before do
     SiteSetting.navigation_menu = "sidebar"
     channel_1.add(current_user)
+    channel_2.add(current_user)
     chat_system_bootstrap
     sign_in(current_user)
   end
@@ -145,6 +147,15 @@ RSpec.describe "Separate sidebar mode", type: :system do
 
         expect(sidebar_component).to have_no_section("chat-channels")
         expect(sidebar_component).to have_section("Categories")
+
+        chat_drawer_page.open_channel(channel_2)
+
+        expect(chat_drawer_page).to have_open_channel(channel_2)
+
+        chat_drawer_page.close
+        sidebar_component.switch_to_chat
+
+        expect(chat_drawer_page).to have_open_channel(channel_2)
       end
     end
 
@@ -182,6 +193,16 @@ RSpec.describe "Separate sidebar mode", type: :system do
 
         expect(sidebar_component).to have_no_section("chat-channels")
         expect(sidebar_component).to have_section("Categories")
+
+        sidebar_component.switch_to_chat
+        sidebar_page.open_channel(channel_2)
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
+
+        chat_page.close_from_header
+        sidebar_component.switch_to_chat
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
       end
     end
   end
@@ -222,6 +243,15 @@ RSpec.describe "Separate sidebar mode", type: :system do
 
         expect(sidebar_component).to have_section("Categories")
         expect(sidebar_component).to have_section("chat-channels")
+
+        sidebar_page.open_channel(channel_2)
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
+
+        chat_drawer_page.close
+        sidebar_component.switch_to_chat
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
       end
     end
 
@@ -259,6 +289,16 @@ RSpec.describe "Separate sidebar mode", type: :system do
 
         expect(sidebar_component).to have_section("chat-channels")
         expect(sidebar_component).to have_section("Categories")
+
+        sidebar_component.switch_to_chat
+        sidebar_page.open_channel(channel_2)
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
+
+        chat_page.close_from_header
+        sidebar_component.switch_to_chat
+
+        expect(sidebar_component).to have_section_link(channel_2.name, active: true)
       end
     end
   end