Fix specs

app/models/note.rb

@@ -121,7 +121,7 @@ class Note < ActiveRecord::Base
     end
     def grouped_diff_discussions(diff_refs = nil)
-      groups = Hash.new { |h, k| h[k] = [] }
+      groups = {}
       diff_notes.fresh.discussions.each do |discussion|
         line_code =
@@ -131,7 +131,10 @@ class Note < ActiveRecord::Base
             discussion.original_line_code
           end
-        groups[line_code] << discussion if line_code
+        if line_code
+          discussions = groups[line_code] ||= []
+          discussions << discussion
+        end
       end
       groups

lib/gitlab/diff/position_tracer.rb

@@ -168,7 +168,6 @@ module Gitlab
         bd_diff = bd_diffs.diff_file_with_old_path(b_path)
-        d_path = bd_diff&.new_path || b_path
         d_line = LineMapper.new(bd_diff).old_to_new(b_line)
         cd_diff = cd_diffs.diff_file_with_old_path(c_path)

spec/features/merge_requests/discussion_spec.rb

@@ -43,7 +43,7 @@ feature 'Merge Request Discussions', feature: true do
       it 'shows a link to the outdated diff' do
         within(".discussion[data-discussion-id='#{outdated_discussion.id}']") do
           path = diffs_namespace_project_merge_request_path(project.namespace, project, merge_request, diff_id: old_merge_request_diff.id, anchor: outdated_discussion.line_code)
-          expect(page).to have_link('an outdated diff', href: path)
+          expect(page).to have_link('an old version of the diff', href: path)
         end
       end
     end

spec/helpers/notes_helper_spec.rb

@@ -92,7 +92,13 @@ describe NotesHelper do
             )
           end
-          let(:discussion) { create(:diff_note_on_merge_request, noteable: merge_request, project: project, position: position).to_discussion }
+          let(:diff_note) { create(:diff_note_on_merge_request, noteable: merge_request, project: project, position: position) }
+          let(:discussion) { diff_note.to_discussion }
+
+          before do
+            diff_note.position = diff_note.original_position
+            diff_note.save!
+          end
           it 'returns the diff version comparison path with the line code' do
             expect(helper.discussion_path(discussion)).to eq(diffs_namespace_project_merge_request_path(project.namespace, project, merge_request, diff_id: merge_request_diff3, start_sha: merge_request_diff1.head_commit_sha, anchor: discussion.line_code))

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -54,6 +54,7 @@ Note:
 - type
 - position
 - original_position
+- change_position
 - resolved_at
 - resolved_by_id
 - discussion_id