Fix filename duplication in design notes in activity feeds

app/helpers/notes_helper.rb

@@ -3,6 +3,13 @@
 module NotesHelper
   MAX_PRERENDERED_NOTES = 10
 
+  def note_target_title(note)
+    # The design title is already present in `Event#note_target_reference`.
+    return if note.nil? || note.for_design?
+
+    note.title
+  end
+
   def note_target_fields(note)
     if note.noteable
       hidden_field_tag(:target_type, note.noteable.class.name.underscore) +

app/views/events/event/_note.html.haml

@@ -7,8 +7,10 @@
   %span.event-type.d-inline-block.append-right-4{ class: event.action_name }
     = event.action_name
   = event_note_title_html(event)
-  %span.event-target-title.append-right-4{ dir: "auto" }
-    = """.html_safe + event.target.title + "&quot".html_safe
+  - title = note_target_title(event.target)
+  - if title.present?
+    %span.event-target-title.append-right-4{ dir: "auto" }
+      = """.html_safe + title + "&quot".html_safe
 
   = render "events/event_scope", event: event
 

changelogs/unreleased/fix-design-notes-filename-duplication.yml

+---
+title: Fix filename duplication in design notes in activity feeds
+merge_request: 32823
+author: Arun Kumar Mohan
+type: fixed

spec/helpers/notes_helper_spec.rb

@@ -24,6 +24,36 @@ describe NotesHelper do
     project.add_guest(guest)
   end
 
+  describe '#note_target_title' do
+    context 'note does not exist' do
+      it 'returns nil' do
+        expect(helper.note_target_title(nil)).to be_blank
+      end
+    end
+
+    context 'target does not exist' do
+      it 'returns nil' do
+        note = Note.new
+        expect(helper.note_target_title(note)).to be_blank
+      end
+    end
+
+    context 'when given a design target' do
+      it 'returns nil' do
+        note = build_stubbed(:note_on_design)
+        expect(helper.note_target_title(note)).to be_blank
+      end
+    end
+
+    context 'when given a non-design target' do
+      it 'returns the issue title' do
+        issue = build_stubbed(:issue, title: 'Issue 1')
+        note = build_stubbed(:note, noteable: issue)
+        expect(helper.note_target_title(note)).to eq('Issue 1')
+      end
+    end
+  end
+
   describe "#notes_max_access_for_users" do
     it 'returns access levels' do
       expect(helper.note_max_access_for_user(owner_note)).to eq(Gitlab::Access::OWNER)