Only add a description change note when no tasks are updated

app/services/issuable_base_service.rb

@@ -313,11 +313,13 @@ class IssuableBaseService < BaseService
     end
 
     if issuable.previous_changes.include?('description')
-      create_description_change_note(issuable)
-    end
-
-    if issuable.previous_changes.include?('description') && issuable.tasks?
-      create_task_status_note(issuable)
+      if issuable.tasks? && issuable.updated_tasks.any?
+        create_task_status_note(issuable)
+      else
+        # TODO: Show this note if non-task content was modified.
+        # https://gitlab.com/gitlab-org/gitlab-ce/issues/33577
+        create_description_change_note(issuable)
+      end
     end
 
     if issuable.previous_changes.include?('time_estimate')

spec/services/issues/update_service_spec.rb

@@ -31,6 +31,13 @@ describe Issues::UpdateService, services: true do
       end
     end
 
+    def find_notes(action)
+      issue
+        .notes
+        .joins(:system_note_metadata)
+        .where(system_note_metadata: { action: action })
+    end
+
     def update_issue(opts)
       described_class.new(project, user, opts).execute(issue)
     end
@@ -330,6 +337,9 @@ describe Issues::UpdateService, services: true do
 
           expect(note1).not_to be_nil
           expect(note2).not_to be_nil
+
+          description_notes = find_notes('description')
+          expect(description_notes.length).to eq(1)
         end
       end
 
@@ -345,6 +355,9 @@ describe Issues::UpdateService, services: true do
 
           expect(note1).not_to be_nil
           expect(note2).not_to be_nil
+
+          description_notes = find_notes('description')
+          expect(description_notes.length).to eq(1)
         end
       end
 
@@ -354,10 +367,12 @@ describe Issues::UpdateService, services: true do
           update_issue(description: "- [x] Task 1\n- [ ] Task 3\n- [ ] Task 2")
         end
 
-        it 'does not create a system note' do
-          note = find_note('marked the task **Task 2** as incomplete')
+        it 'does not create a system note for the task' do
+          task_note = find_note('marked the task **Task 2** as incomplete')
+          description_notes = find_notes('description')
 
-          expect(note).to be_nil
+          expect(task_note).to be_nil
+          expect(description_notes.length).to eq(2)
         end
       end
 
@@ -368,9 +383,11 @@ describe Issues::UpdateService, services: true do
         end
 
         it 'does not create a system note referencing the position the old item' do
-          note = find_note('marked the task **Two** as incomplete')
+          task_note = find_note('marked the task **Two** as incomplete')
+          description_notes = find_notes('description')
 
-          expect(note).to be_nil
+          expect(task_note).to be_nil
+          expect(description_notes.length).to eq(2)
         end
 
         it 'does not generate a new note at all' do

spec/services/merge_requests/update_service_spec.rb

@@ -30,6 +30,13 @@ describe MergeRequests::UpdateService, services: true do
       end
     end
 
+    def find_notes(action)
+      @merge_request
+        .notes
+        .joins(:system_note_metadata)
+        .where(system_note_metadata: { action: action })
+    end
+
     def update_merge_request(opts)
       @merge_request = MergeRequests::UpdateService.new(project, user, opts).execute(merge_request)
       @merge_request.reload
@@ -394,6 +401,9 @@ describe MergeRequests::UpdateService, services: true do
 
           expect(note1).not_to be_nil
           expect(note2).not_to be_nil
+
+          description_notes = find_notes('description')
+          expect(description_notes.length).to eq(1)
         end
       end
 
@@ -409,6 +419,9 @@ describe MergeRequests::UpdateService, services: true do
 
           expect(note1).not_to be_nil
           expect(note2).not_to be_nil
+
+          description_notes = find_notes('description')
+          expect(description_notes.length).to eq(1)
         end
       end
     end