FIX: Conditionally hide 'My Threads' on mobile (#25494)

plugins/chat/assets/javascripts/discourse/components/chat-footer.gjs

@@ -14,15 +14,23 @@ export default class ChatFooter extends Component {
   @service router;
   @service chat;
   @service siteSettings;
+  @service currentUser;
 
-  threadsEnabled = this.siteSettings.chat_threads_enabled;
+  get includeThreads() {
+    if (!this.siteSettings.chat_threads_enabled) {
+      return false;
+    }
+    return this.currentUser?.chat_channels?.public_channels?.some(
+      (channel) => channel.threading_enabled
+    );
+  }
 
   get directMessagesEnabled() {
     return this.chat.userCanAccessDirectMessages;
   }
 
   get shouldRenderFooter() {
-    return this.threadsEnabled || this.directMessagesEnabled;
+    return this.includeThreads || this.directMessagesEnabled;
   }
 
   <template>
@@ -63,7 +71,7 @@ export default class ChatFooter extends Component {
           </DButton>
         {{/if}}
 
-        {{#if this.threadsEnabled}}
+        {{#if this.includeThreads}}
           <DButton
             @route="chat.threads"
             @icon="discourse-threads"

plugins/chat/spec/system/chat_footer_spec.rb

@@ -40,14 +40,34 @@ RSpec.describe "Mobile Chat footer", type: :system, mobile: true do
       expect(page).to have_current_path("/chat/channels")
     end
 
-    it "shows threads tab when user has threads" do
-      SiteSetting.chat_threads_enabled = true
+    context "when user is a member of at least one channel with threads" do
+      it "shows threads tab when user has threads" do
+        SiteSetting.chat_threads_enabled = true
 
-      visit("/")
-      chat_page.open_from_header
+        visit("/")
+        chat_page.open_from_header
 
-      expect(page).to have_css(".c-footer")
-      expect(page).to have_css("#c-footer-threads")
+        expect(page).to have_css(".c-footer")
+        expect(page).to have_css("#c-footer-threads")
+      end
+    end
+
+    context "when user is not a member of any channel with threads" do
+      before do
+        other_channel = Fabricate(:chat_channel, threading_enabled: false)
+        other_channel.add(user)
+        channel.remove(user)
+      end
+
+      it "shows threads tab when user has threads" do
+        SiteSetting.chat_threads_enabled = true
+
+        visit("/")
+        chat_page.open_from_header
+
+        expect(page).to have_css(".c-footer")
+        expect(page).to have_no_css("#c-footer-threads")
+      end
     end
   end